I'm running that exact rig except with an asus slotkit. Had this mb for 3 years, love it and always seem to find a faster cpu for it but its end of the road now. My 900 is a cdo stepping (they only make 900 in cdo +) and has a GW modded hs/fan and I put 1.8v into it. I overclock to 1200 and my asus 6800 vid card takes it find. Its sitting in a cheap small tower right now and is hotter than it should be but runs great. Update to the last bios (2.55 I think?) and set your slotkit for coppermine(100) rather than celeron(66)
Its a great upgrade and hope you get a good cpu.