With a budget of $1000, don't even think about the newest graphics cards, because just one will take half of your budget easy.
The build Diablo posted is good. You can substitute other brands for the memory, hard drive, burner, and graphics card in you wanted. Or, you could gut the additions you have put into the Dell (burner, possibly memory) to save a little cha-ching on the front end, and upgrade later.
My Rig: SABLE
Antec 300 Illusion / Antec EarthWatts EA650 650W / EVGA GTX 760 2GB
AMD FX 8320 x8 Black Edition / Gelid Tranquillo / MSI 970A-G43
Sandisk Ultra Plus 128GB / Samsung 840 120GB / WD Black 750GB / WD Green 1TB / WD Red 3TB
G.SKILL Ripjaws 2x2GB DDR3 1600 - Crucial Ballistix Tracer 2x2GB DDR3 1600
Win7 Ult 64-bit - Func MS3 Mouse - CM Storm QuickFire Rapid Mech Keyboard
R.I.P. Danny L. Trotter
... 14 Nov 1945 - 4 Sept 2009