I know you've already bought the card, but in response to some other remarks:
IMHO, I'd take the better image quality of the retail 8500LE over the small increase in speed the 4200 has. But then again I use it mostly for CAD work.
I've been using ATI cards since the original EGA wonder (1987 I believe it was) and have had three serious driver problems (VGA WonderXL/Win 3.11, Rage128/Win2000, Cat2.2/Win2000). That's just my experience.
*Dual PIII-800 @900 i440BX and Tualeron 1.2 @1.74 i815*