Is that stuff going into the system in your signature? The 6600GT will really give you a big graphics performance boast, and I assume the 80GB is used as secondary storage?
For $200 it's a good upgrade and you'll see quite a bit of an overall performance boast. Have you overclocked your Venice by any chance?
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