Try Rainbow Six Vegas 1 and 2. Also try Stalker if you can.(Only recommended for 2GB and above RAM users
)
Edit: I am an Ati fanboy too but that's mostly because two of my earlier cards were Nvidia (XFX) and they cooked themselves up within a span of two months. After that I switched loyalty and picked up the red babe.....uhm...err the Ati X1800GTO and never looked back at the green side again.
That was one hell of a card and still is. It's still able to play the latest games at decent settings.