I have a 9500 Pro and I LOVE IT!!!! i can run HL2 everything maxed, except AA/AF. it still impresses me. if you run 3Dmark at all you can expect scores similar to these:
3DMark 01: 14308
03:3917
05:1733
And i don't even OC this thing.
if you are going to OC it though, you are going to want to buy a new VGA cooler. ArcticCooling has a good VGA cooler that will fit on a 9500 Pro. check their website.