Will these computer specs fit together?

While I'll agree that you should go with no less than x600 as aforementioned, I will say you should go with faster ram... your board supports DDR2-1200. If you're looking for all around performance then the ram will make a bigger difference over the video card... For the record i use an XFX 8600gt in a budget gamer and can run Borderlands and Dragon Age: Origins at maxed settings with zero lag for the most part. So if a 9600 is not in your budget, then going with an 8800gtx would give you ample performance.