The SLI setup is my main video cards. I love them to death. I played crysis at 1280x1024 all high settings dx9, with about 30-35 fps throughout the game. My 8800gts plays 1280x1024 all high and some very high dx10 with about 40-50 fps.
if you overclocked your system good...you will be able to play on high settings
i would save, then buy a high - end card when there comes a game you can't play