You should post this in GH, more people could help you there that don't venture over here.
The TI-4200s are excellent cards. I paid $165 for a retail MSI card before labor day and I've been nothing but happy with it. I play UT2k3 at 1280x1024 with details maxed and it never lags.
My GF2 GTS still played all current games though. In America's Army, it lagged badly in one level, but other then that, I had played every new game (prior to UT2k3) on it. Usualy around 800x600 with details medium to max, depending on the game.