How about this....even though the formatting is a bit weird, it's under your budget. I purposefully left the ram at 8gb so you can upgrade later, of course, this will involve you buying the ram and putting it in yourself, but that's so easy...it'll save you like 50% off the ram prices of that site since they're still charging so much for dirt cheap ddr3.
Case is extravagant and you can downgrade some stuff, but you have a 2500 budget and I did my best....of course, if you want sli 580's you can downgrade the case or the motherboard or something to fit it in the budget. You can also find your own way of getting windows 7 to save some money...like msdnn or something.
I wasn't sure if you're going to overclock it or not, but overall, i think it's pretty solid...not as good as building it yourself, but you don't have the time
EDIT: Also some room in there for a nice ssd, i left that out in case you wanted to take the dive and buy that separately and install it yourself. Again, installing a drive is easy...BUT, if you do go for an ssd, which i recommend you doing, you probably should get your windows 7 somewhere else and install it to the ssd instead of the HDD configured in this build.
Since you're using a lot of photoshop and what not, let me know if you need more drives, etc, and I can look through the build for you
Also, some weird things like the mouse and what not came free, so yeah. FREE GAMES. YEEE
Edited by Kick - 10/8/11 at 12:42pm