Oh, I misread your specs and thought it was a laptop.
Yes, buy a dedicated GPU like the GTX 750.
You can also buy an upgraded CPU, like the E5800, which is a dual core CPU running at 3.20 GHz, which will be a slight speed up for you. Nothing super dramatic, but may help get you from 95 to 100 percent speed in a game. You can get one from eBay for like under $10
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR2.TRC0.A0.H0.Xe5800.TRS0&_nkw=e5800&_sacat=0
Or buy a new motherboard and a 6th gen i3 for like $200 or so and put it in your case if it supports it, get some more ram for $40-$70, and maybe a new hard drive or SSD.
Yes, buy a dedicated GPU like the GTX 750.
You can also buy an upgraded CPU, like the E5800, which is a dual core CPU running at 3.20 GHz, which will be a slight speed up for you. Nothing super dramatic, but may help get you from 95 to 100 percent speed in a game. You can get one from eBay for like under $10
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR2.TRC0.A0.H0.Xe5800.TRS0&_nkw=e5800&_sacat=0
Or buy a new motherboard and a 6th gen i3 for like $200 or so and put it in your case if it supports it, get some more ram for $40-$70, and maybe a new hard drive or SSD.