Buying a MacBook Pro - Help Suggestions

Hi,
I'm looking to get a new computer. I'm considering a MacBook Pro and could use some advice.
I'm a front-end web developer, who primarily works from home. In the instances in which I work for a client on-site, I usually use their equipment/software, otherwise, I'd be using this Mac.
The programs I primarily use are:
Photoshop
Illustrator
Chrome
Firefox
Safari
text editor)
Word
Excel
My Photoshop files can be pretty large, and it's not uncommon for me to have a dozen or so tabs open in each browser. The program I use the most would probably be my text editor of choice, as I spend the most time coding (HTML, CSS, JavaScript). I also listen to music all day via YouTube. Additionally, I tend to work with all my applications/browsers open simultaneously, as I switch frequently between them.
Though I'm not a gamer, I intend to learn mobile development (both iOS and Android) this year.
A number of my clients use Internet Explorer, so I'd like to view IE on the Mac. I see that there's a program called VMWare Fusion which will allow me to view IE on the Mac. I currently have an old Dell computer that I will continue to use, if need be for PC-specific tasks.
With all that said, this looks like something that would fit me:
Refurbished 15.4-inch MacBook Pro 2.3GHz Quad-core Intel i7 with Retina Display
15.4-inch (diagonal) Retina display; 2880-by-1800 resolution at 220 pixels per inch
16GB of 1600MHz DDR3L SDRAM
256GB Flash Storage1
720p FaceTime HD camera
Intel Iris Pro Graphics
I'm not sure if I need that much RAM. I'm also willing to go down to 13-inch. This one in particular might be the better buy:
Refurbished 13.3-inch MacBook Pro 2.9GHz Dual-core Intel i7
13.3-inch (diagonal) LED-backlit glossy widescreen display, 1280-by-800 resolution
8GB (2 x 4GB) of 1600MHz DDR3 SDRAM
750GB Serial ATA @ 5400 rpm
8x double-layer SuperDrive (DVD±R DL/DVD±RW/CD-RW)
Intel HD Graphics 4000
...but I'm uncertain, as I think I should go with Quad-core over the Dual-core.
My budget is less than $2000, around $1500 (or less, if possible).
Any advice, tips as to what to look for would be greatly appreciated. Let me know if I need to provide any further information.
Thanks.
Stephen

Stephen,
it seems as though Photoshop and Illustrator would be the most voracious consumers of RAM among your primary programs. Because the RAM is soldered in on the Retina models, it’s non-upgradeable; so if you prefer a Retina model, I’d recommend that you go for a Retina model with 16 GB of RAM. (The non-Retina models have sockets, so their RAM is upgradeable.) If you prefer to work with all of your programs opened simultaneously, then don’t underestimate the importance of sufficient RAM.
I use a 13-inch Mid 2010 MacBook Pro myself, and it suffices for my needs (once I’d installed a SSD), but I don’t use Photoshop-type programs, so I don’t know if you’d find the 1280×800 resolution to be limiting in Photoshop. The discrete GPUs on the 15-inch models would also be of benefit to graphics-intensive programs.
With either of your choices, you could also install Windows on your MacBook Pro by using Boot Camp, and choose which OS to start at boot time. Either of your choices above could run 64-bit Windows 7 or Windows 8 in Boot Camp; the non-Retina model could also run 32-bit Windows 7.

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    Why shouldn't you use commercial AV products?
    ☞ To recognize malware, the software depends on a database of known threats, which is always at least a day out of date. This technique is a proven failure, as a major AV software vendor has admitted. Most attacks are "zero-day"—that is, previously unknown. Recognition-based AV does not defend against such attacks, and the enterprise IT industry is coming to the realization that traditional AV software is worthless.
    ☞ Its design is predicated on the nonexistent threat that malware may be injected at any time, anywhere in the file system. Malware is downloaded from the network; it doesn't materialize from nowhere. In order to meet that nonexistent threat, commercial AV software modifies or duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability, bugs, and poor performance.
    ☞ By modifying the operating system, the software may also create weaknesses that could be exploited by malware attackers.
    ☞ Most importantly, a false sense of security is dangerous.
    8. An AV product from the App Store, such as "ClamXav," has the same drawback as the commercial suites of being always out of date, but it does not inject low-level code into the operating system. That doesn't mean it's entirely harmless. It may report email messages that have "phishing" links in the body, or Windows malware in attachments, as infected files, and offer to delete or move them. Doing so will corrupt the Mail database. The messages should be deleted from within the Mail application.
    An AV app is not needed, and cannot be relied upon, for protection against OS X malware. It's useful, if at all, only for detecting Windows malware, and even for that use it's not really effective, because new Windows malware is emerging much faster than OS X malware.
    Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else. A malicious attachment in email is usually easy to recognize by the name alone. An actual example:
    London Terror Moovie.avi [124 spaces] Checked By Norton Antivirus.exe
    You don't need software to tell you that's a Windows trojan. Software may be able to tell you which trojan it is, but who cares? In practice, there's no reason to use recognition software unless an organizational policy requires it. Windows malware is so widespread that you should assume it's in everyemail attachment until proven otherwise. Nevertheless, ClamXav or a similar product from the App Store may serve a purpose if it satisfies an ill-informed network administrator who says you must run some kind of AV application. It's free and it won't handicap the system.
    The ClamXav developer won't try to "upsell" you to a paid version of the product. Other developers may do that. Don't be upsold. For one thing, you should not pay to protect Windows users from the consequences of their choice of computing platform. For another, a paid upgrade from a free app will probably have all the disadvantages mentioned in section 7.
    9. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use in the Sharing preference pane. All are disabled by default.
    10. As a Mac user, you don't have to live in fear that your computer may be infected every time you install software, read email, or visit a web page. But neither can you assume that you will always be safe from exploitation, no matter what you do. Navigating the Internet is like walking the streets of a big city. It's as safe or as dangerous as you choose to make it. The greatest harm done by security software is precisely its selling point: it makes people feel safe. They may then feel safe enough to take risks from which the software doesn't protect them. Nothing can lessen the need for safe computing practices.

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