There's no such thing as a 3800+ Clawhammer, it'd be a 4000+ Clawhammer if that were the case.
Get a 3000+, I kinda regret spending the extra money on a 3200+ now but oh well. I have a friend running a 3000+ at 2.7GHz @ 1.6v with an XP-90, and that'll school any 3700+ or 3800+.
Intel C2D E6320 / AMD Athlon X2 3800+
Gigabyte 965P DS3 / DFI nF4 Ultra-D
2GB OCZ Gold PC2-6400 / 2GB OCZ Gold PC4000
eVGA 8800GTS 320MB / eVGA 6800GS 256MB
150GB Raptor / 74GB Raptor
2x500GB / 320GB
OCZ GameXStreme 850w / OCZ StealthXStream 600w