^OP already bought a new PC.
Thanks for reply Wikedsmart. I took your advice and purchased a pc from ebay. It was a dell floor model so i got it for $356 + $30 shipping. Seller has 83,000 sells with 95% feedback so I should hopefully be safe.
DELL INSPIRON 620 CORE i5-2310 2.9GHz 6GB 1TB DVD±R/RW WLAN W7 64-BIT
@Wicked_smart: Upon searching, OP got this one: link
Actually 99.5% good feedback.
@lahoward: You got a really good deal even though its an OEM pre-built machine and "most of us" hate this idea. The same spec'ed system is about $650-700 on at most places, but it was on sale for $530 two days ago on Dell.
Still, for your needs and price requirement, its a powerful PC that can easily be turned into a cheap, low end gaming rig. The down side is that Dell cheap'ed out on the mobo so you don't even get dual channel ram, but you do get a pcie x16 and three pcie x1 slots. Comes with a 300w psu that will work well for low/entry level gpu's, but I wouldn't stick a mid range gpu that requires a 6pin pcie power connector without first upgrading to a beefier power supply; which won't be too expensive.
If you go with wicked's gpu choice, the 6770 (which is a very excellent choice, hits a good price/performance ratio and low powered at 108w), it does require a 6 pin pcie 12v power connector. Now the 6770 does include a 2x 4pin molex to 6pin 12v pcie adapter; the thing is because its a pre-built using dell's own power supply, there are no molex connectors to speak of
! It's all SATA power cables! You can look at the inside of the case on newegg here: link
, or wait till you get your PC.
So either you be brave, spice or re-pin a connector so the dell PSU can be used OR you spend the extra 20-30 for an upgraded PSU that has more power, the right connectors and more efficient with 80+ or higher certification (80+ or 80+ bronze and up is recommended).
Recommended cheap PSU's:
There's a few others, but they aren't on sale so they hit a higher price point right now. The Antec NEO 630w psu was on sale earlier this week for $30 that was a slickdeal, but its over. Also Corsair's 430w v2 builder series used to be around $20-30 that would have fit the budget really well; even was $17 AR about two weeks ago, but its now back up to around 36 or so. Personally, I'd suggest the 600w OCZ psu because its a fantastic unit and its the cheapest, quality made modular power supply right now; cheaper than their 500w right now since its on sale. 600w is WAY over your needs, but don't fret since it'll still be as efficient at lower draws since you'd probably barely pull 200w from the wall, even with the 6770.
You can also lower your gpu requirement and pick something that doesn't require a 6pin pcie power connector; just uses the 75w supplied by the pcie x16 like: