My Athlon Xp 2000 with a GeForce4 has an average of 65, going at 70 when I play for a while... My heatsink runs at 6100rpm so I guess it's ok.

I know I can handle up to 90(?) but I believe it's a bit high... What's the best heatsink out there? or what can I do to cool it down besides throwing ice cubes on it?