Good heatsink which will fit on a M7NCD Pro?

[f2racer]

I just upgraded my kids PC from a Duron 1800 to an Athlon XP 2100+ tbred CPU. I was using the 2100+ at 2700+ speeds (by increasing the FSB from 133 to 166) on another motherboard in conjunction with a big Thermaltake heatsink (don't remember the exact model, but it's really big and heavy). Unfortunately there are clearance problems on the M7NCD Pro motherboard with this heatsink, so it's currently setup to use the cheap Kingwin aluminum heatsink I was using with the Duron. With the Kingwin heatsink, temps hover in the mid 40 C (between 44-48 C) at idle and I get random system crashes and reboots when I try to OC the CPU. Does anybody know of a decent heatsink which will properly fit in the M7NCD Pro which will allow me to OC the new CPU?

Thanks!

[ashland_thunder]

Thermalright SI97, works awesome