best way for you would be selling your nvidia gfx and buying AMD/ATI instead. I think you will be able to find good candidates among AMD lines in threads already existing.
Yep, best advice yet tbh.
If you want BTC and don't have proper mining hardware, you should really just buy them over mining them. You'll get more BTC/dollar that way. Don't think that mining is the only way to get BTC, and don't think that it's free either. With inadequate hashing power, you, or the person responsible for the bill, will be spending more on electricity than you will receive through BTC.