your current cpu is already bottlenecking your current video card. if you get a 6870 you will hardly notice any FPS increase due to your slow CPU, you will have miserable playability. CPU upgrade first. Gat the 955BE as others have suggested. It will not likely be futureproof for 4 years, but if you have survived with your 5000+ up tiill now, it may be good enough for you.