The HD 5750 is a safe upgrade. It basically provides the performance of the HD 4850, is DX11 (if you care), and consumes slightly less power than your HD 4670.
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Reply to jaguarskx
Ya that generic shouldn't be really to reliable with high end cards. The 5750 would be your best bet. It performs like a 4850/gts250 and uses a lot less power. At the resolution your running at its adequate.