I've been an Intel fan since my first machine in March of 94 when the 75-MHz DX4 processor shipped. From then on, my only AMD rig was the K6 233 wihch was good, but i still lean toward the Celeron 233 that my friend had with a similar setup because we did our own comparisons while gaming.
My next machine was the P3-600E, the best runner I've ever owned, a rock solid machine that lasted me 5 years, til a relative insisted on an offer I couldn't refuse. With that said, I had the money to buy a nine-hundred dollar P4 3.2 EE proc. Sadly, it sat for two months because I had to scrounge for some change and eat canned spam just to get a mobo for it.
Nevertheless, the P4's former gaming weakness against the Athlon 64 has been ironed out by the 2 MB L3 cache. The AMD Athlon 64 FX-51 is only marginally slower.
Take your pick...if you are in the economy class you'd opt for the AMD 64 or join me for lunch over canned spam.