Noticeable difference between dual 1.8 and dual 2.4?

Hey all,
I'm just about to pull the plug on buying a used G5 on Craigslist: dual 1.8ghz, 3gb DDR SDRAM, Leopard, 20" display, $800. My only reason for hesitation is that this is going to be my primary computer, and is replacing my beat up four year old Powerbook that's no longer 100% reliable. I'm using it primarily for graphic design (Photoshop), photography (Lightroom), and music recording (ProTools).
My question, now, is: would it be worthwhile to hold out and get one with dual 2.4ghz processors and spend $100 or $200 more? Is there that big of a difference? (Keep in mind I'm a broke and graduating from college in two days!).
Thanks!
Alec

Ask for the condition of the machine and I would certainly ask for pictures.
I bought once a " mint " Cube system only to receive it with chocolate stuck in the keyboard, deep scratches on the cube shell and only a 15" LCD instead of 17" (Quite a difference in cost at the time) I say that not to give you cold feet, but as something to be aware of. Don't know if you have bought used systems before and how picky you are on. I am quite picky on my stuff and treat it with a lot of care. So, mint condition should be mint and shows the user to care of the machine. Tiny scratch here or there and/or a nick happens. Owner shouldn't have a problem disclosing it. I just saw a small scratch on my G5 door the other day when I cleaned it ... Anyway, I have seen and worked some laptops I wouldn't want to own or be seen with, even if they were given to me free! Same with some cellphones I've seen ... it's like they've been dragged behind a car.
Enquire how intensely the machine was used. Pro video editing as a business is quite a bit more stressful than home computer in the evening and weekend and may affect the total lifespan in years.
One thing that you can do is ask for screen grabs of the System Profile ( Command + Shift + 4, select area) or have them save the entire profile and email it to you.
Utilities > System Profiler > File > Save as ...
You could request an xbench score http://www.xbench.com/ using the xbench application
and then do a quick comparison here http://db.xbench.com/
Quite some factors can be playing in the score though, like the hard drive, graphics card, version of the OS, etc. But could be an additional reference.

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