I haven't built an Intel system in a while - I'm either going with an A64 x2 5000+ BE and o/cing the piss out of it, or going with an E21xx or E4500/4600 and o/cing the piss out of that. What say ye, Massassi?

5000+ BE - $97
E4500 - $120
E4600 - $140

I'm buying a new motherboard either way - my current motherboard/cpu is going to my brother.

Edit: Well, I went for it...a bit more on the budget side than I was originally planning, but the spare cash would probably be better used upgrading my 7900GT rather than the processor (the 2180 should hit 3Ghz):

Intel Pentium E2180 Allendale 2.0GHz LGA 775 65W Dual-Core Processor Model BX80557E2180 - Retail
$89.99 - $30 MIR ($59.99)

ABIT IP35-E LGA 775 Intel P35 ATX Intel Motherboard - Retail
$79.99

$7.48 s/h