okay, what are you going to be doing? games? surfing the net? megatasking? it all depends.
while there is a plethora of support for intel (because they have a stranglehold on the market), amd based motherboards have a more efficient architecture. and amd k8 cpus are much easier to overclock.
this is a weird time to make this choice because the industry is holding it's breath for amd's k10 (phenom) cpu and the it's new am3 socket. k10 chips will have ram controllers for both ddr2 and ddr3 onboard and they will be backwards compatible with am2 sockets. so if you buy an am2 mobo now, it'll be easy to upgrade down the road when k10 chips are more affordable.
while it's true that intel chips are benchmarking better out of the box, it takes almost nothing to wake up an amd x2. if you know how to overclock the cost/benefit ratio is in amd's corner.
right on, it always feels good to go fast on cheap parts. i'm just wondering how your voltages and temps look because that's an impressive amount of gain! you can download free apps to monitor your mobo and core readings here: