New gaming build / home computer

Good afternoon,

I have been looking around for building a new computer mostly for the purpose of gaming (though the only new game I plan on playing right now is Starcraft II, the next being Prototype) and my last computer build was 2005 and I spent roughly $1500. I also run some theoretical simulations and image processing that would still require processing speed. On occasion I would be using Photoshop CS4 as well for editing.

This time I'm looking to spend somewhere in the range of $600-750 dollars. I have windows XP so I am just going to buy the windows 7 home upgrade and work from there. The other thing to note is my monitor resolution will be 1280x1024 so I think that some of the hardware that I have selected may be overkill. As you can tell I'm outside my price range with a total of $943 but this is base price of the hardware without specials, etc.

I also probably won't buy for at least another month, and may end up waiting until closer to the end of the year. Depending on deals and specials I may buy products over the span of a few weeks instead of all at once.

COOLER MASTER Centurion 5 CAC-T05-UW Black Aluminum Bezel $55
Antec EarthWatts EA650 650W $80
i5-750 $195
CORSAIR 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 $85
SAMSUNG Spinpoint F3 HD502HJ 500GB $55
GTX 460 $200
ASUS P7P55D EVO LGA 1156 Intel P55 $145
win7 $110
LG Black 22X DVDRW $18
total 943

I'm not sure if it is necessary to have the GTX 460 as it may be possible to get by with something like the GTX 250. I would like to have SLI capabilities in my motherboard in case i want to buy a 2nd GPU later on.

Please let me know what you think, and possibly where I could trim some things back.