If you're within a budget, Specs will depend on your area, try to check your competitor kung ano yung specs nila

If your going for intel
Core 2 is the best but price is still high, with your budget you can go pentium d (dual core), but power consumption is too high, talo ka sa kuryente.

So I guess P4 3.0 ka as for now. get higher ram and video card capacity.