Hmmm... actually, I just similarly bought a whole new computer, component by component, a few days ago. From what I'VE gatyhered, at the higher end of the market, Intel dual-core processors simply outperform the AMD equivalents. I'm not sure about overclocking inm general, but my shiny new Core 2 Duo 6600 (2.4Ghz) runs very cool, and there seems to be a whole load of overclocking potential. I might look into that later.

This is my two cents, but, I'd go with Intel, even if you ARE looking to overclock. ALSO you have to consider that AMD is a bad long-term choice - I understand AMD is about to change the sockets of a whole load of their processors, 939 to AM2 to AM3. From what I understand, they're playing catch-up. Go with Intel, if I were you. Get a dual-core intel. You can always upgrade later using the same socket to a nicer dual-core intel. You may not be able to have that with AMD depending on what thewy do with their sockets and whatnot.