The aiw128 will run Quake3, Unreal tournament and pretty much anygame before then, but don't expect it to run current games such as morrowind and Unreal Tournament 2003. The GTS however will be able to run all the mentioned titles (albeit fairly slow, but they will run).
The AIW offers the industrys best dvd decoding (ie watching a dvd) and has video in / video out + will offer better 2dquality. If you are looking to game and care less about the multimedia feautures of the card then pick up the GTS-V, but if you have a 19"+ monitor and run in higher resolutions IE 1600*1200 then the 128 is a must.
GTS=games
AIW=everything else
It is up to you
