I have a GT 630 with an i7-3770 3.4GHz cpu and 12 gb ram. Obviously a GT 630 isn't as nice as a GTX 680, however that GPU alone would cost me more than my entire computer... Is that really worth it?
Edit: I was between a GTX 660 and a HD 7770 after everyone's comments. I decided on an HIS Radeon HD 7770 because it can run off my system instead of a separate wire from my PSU since that is very under powered. It is also an exhaust style card and my case had bad circulation. I didn't want to fool around with a new PSU yet so this card seems like a real breeze to change out. Thanks for all the comments!