I don't get why you need to overclock?? (ok my old system was a celeron2 E series 2.2ghz clocked to a stable 4.0ghz)
anyhow my latest machine is
Intel i5 650 @3.2ghz
4gb RAM
NVidia GT460 2gb
1.5tb H/D (non ssd as these are still too new for me

)
Runs everything I need it too (and more!)
and my older machine
Intel Celeron2 E5500 2.2ghz (clocked to 4.0ghz)
OCR Ram 3gb (1x2gb & 1x1gb)
Asus Geoforce 9800GT 512mb
all running on 32 bit Vista (hence the lowish ram)