Hmm, that's a toughy.
The Celerons smaller cache size may limit perfomance, and the lower clock speed of the Pentium may also bottleneck it. As long as you aren't playing high demanding games, although I don't even think you could very successfully, you should be fine.
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