I am thinking about getting either GTX 260 or 9800 GX2 or 9800GTX SLI. They goes 400, 410, 430 respectively. Which one of these will give me the best bang for the buck? I am upgrading from the rig in sig, with a 600w Enermax noisetaker series, might have little trouble running SLI (no trouble running 7800GT SLI though), but I am willing to give it a try, so don't take that into consideration.