Which SSD for Mac Pro 2006 1,1

Hey guys,
I've done a lot of research the past couple days and I think I got a decent amount of knowledge but before I purchase I wanted to ask your opinions.
I have a Mac Pro 2006 with the original hard drives in it and I'm looking to speed it up. I see SSDs are now a lot more affordable so I gotta take advantage.
I use my computer for making music and recording but I do hip hop music, not live music or bands so I don't have to record a lot of tracks at once I just want to speed things up. Plus help my software move a little faster when I make beats.
I'm looking to get a SSD as my boot drive and I want around 250gb to be safe so I narrowed it down to these three:
Intel 730
http://www.amazon.com/Intel-SERIES-2-5-Inch-Internal-SSDSC2BP240G4R5/dp/B00IF4NG EU/ref=lh_ni_t?ie=UTF8&psc=1&smid=A2Y5691XAL3WET
Crucial MX100
http://www.amazon.com/gp/product/B00KFAGCWK/ref=ox_sc_act_title_2?ie=UTF8&psc=1& smid=ATVPDKIKX0DER
Samsung 840 EVO
http://www.amazon.com/gp/product/B00E3W1726/ref=gno_cart_title_4?ie=UTF8&psc=1&s mid=A19W1SYPKVVBJO
I read that there are better/faster SSDs out there but can my old 2006 Mac Pro even make use of better/faster drives speed? Are any of the 3 I've picked reliable enough to feel comfortable purchasing?
I still don't understand what TRIM is exactly, can someone help me with that? I'm gonna go look it up now but just wondered about that specifically with these 3 drives...
I'm also going with a Western Digital Caviar Black 2TB drive for the data... Is that overkill for my 2006 machine? Will I even notice a difference in speed with this Caviar Black as opposed to maybe the Blue or Green drive?
I appreciate the time guys! Thanks so much I'm excited to get my Mac Pro moving like my MacBook Pro with its 300gb SSD

An SSD is probably the best bang-4-buck improvement in performance, and today's are far better than 4 years ago (and avoid all the pitfalls of the early SATA III models).
The larger the SSD, the more "pipes" or channels, and you want to aim for 50% free, you need TRIM to be enabled, and yes you will notice.
Then you want to clone the SSD and have a system restore image that you can boot from and to run Disk Utility repair so that "trimming' is performed.
Sometimes you want to research when you buy one and get it delivered and check to see if there are firmware update for it for your Mac.
I could never go back and be satisfied with even a 10K drive though that can come close - almost - but with a lot of chatter noise.
The 2TB drive will do well. Now make sure to backup, use TimeMachine, and invest in drives and software to clone those. You could use 2-3TB WD Green for those depending on how much data and full that 2TB will be.

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