I have an Onboard SIS Chipset Instead of a real Video card, If I buy a regular AGP or PCI video card Can I still put it on my computer?
Something like this would do the job;
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.478082
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.470904
That total $233 before rebates and $197 after. Then you just need to add whatever video card you want.
The processor is a x3 but the chip is actually a quad core with one of the cores locked. The motherboard allows you to unlock the 4th core in the BIOS. It isn't guaranteed to work but the odds are very good(80-90%.) The power supply can handle any of the cards I mentioned and is modular for a less cluttered case. The ram is 4gb from a decent brand and DDR3 1600.
If you would like a case so you don't have to deal with swapping out the motherboards this one is serviceable and very cheap($23 shipped after the promo code);
http://www.newegg.com/Product/Product.aspx?Item=N82E16811154102
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