If you are lookin with a budget to most effective CPU, i would choose on
both are 90nm.

AMD's side:  the opteron 144     http://www.newegg.com/Product/Product.asp?Item=N82E16819103600
That proc has had an amazing history of easy overclocking to astounding performance increases.  Also has a great gaming history because of it being in the AMD family and also because of the obvious overclocking benefits.
A little more expensive than the Intel overclocker champion but it works better on gaming

Intel's Side: Pentium 805
http://www.newegg.com/Product/Product.asp?Item=N82E16819116001
This dual core processor was just talked about on Tom's Hardware they oc'ed it to 3.8 Ghz, outperforming the opty 144 in everything besides gaming and most high end AMD single core in gaming.  The only thing you need to buy is a better cooler, i recommend the Zalman total copper cooler.  Best part about this proc is that u get 2 3.8 cores for $130 and the price of a nice zalman cooler $40 i think?

I use an FX-53 but i was lookin to change cause its the 130nm version = more heat and energy, and yes im usually an AMD fanboy but Intel has come up with some competition, even though AMD consistently beats Intel's in gaming.

Good luck in whatev u choose

... are the nex AM2 Fx's dual core???