So what about the kepler series coming out, because I am waiting for ivy bridge, and (supposedly) the kepler will be out by then, so any clues on this folks?
EDIT: For example would the GTX 650 be enough for the system? -- Considering it is supposedly comparative to GTX 560... Or perhaps 660 which is comparable to a GTX 580
Who knows? - wait til they're out. Those estimates are just speculation right now. The only legit-looking info on Kepler is the 680, which looks to be 10% better than the HD 7970.
Either way, you'll be looking at the best card for about $350 when you do buy.