does your mobo do 133fsb? i'm decommisioning my 2nd oldest system - at it's core, the mighty AXDA2600DKV3C 2600+ 2133MHz 16x athlon, king of the 133mhz bus!!! that should pop right in and make your box seem like new!!! it gets 4996 cpu in aq3!!!
i feel your pain on having to shoot an old dog... it's kind of sad, since i just got a brand new 6800gs from pny in trade for a broken 6800oc, so it was like a new lease on life for the old girl... alas, even with the pinnacle of 133mhz fsb cpus, the vid card is now held back by the cpu (and the 1gb mem limit on the k7s5a)... and none of my kids or their friends will even play on the thing!!! this is a system that gets 2133 3d06's!!!
newegg has the abit ip35-e for $60 ar and slap in a $50 celly dc and oc the snot out of it and u will have a mouse that roars!!! for anything that u do on your current box it'll be way sufficient... i'm making an assumption that u r'nt a big gamer...
even better if u have a fry's locally... my latest cheapo build was a combo e4500/ecs gm945 mobo, paint the cpu to go 266mhz and 1.5v and have a 2.925ghz 2mb cache system for $118... or don't paint it and get 2.75 on stock voltage...