Getting the most out of a dual core processor

Having recently built my new computer, (thanks to all the guys here who helped me), I'd say a new video card depends on your budget and how important eyecandy is to you. I used an 8600GTS card in my computer running on an E6600 processor. This card works fine for me for the games I play (CS Source, AOE3, Oblivion). AOE3 was able to crank out maximum quality, as was CS Source. Oblivion needed some notches turned down to be enjoyable (namely grass). I'm playing my games at 1280x1024, so if you plan on going higher than that and have some cash on you, the 320MB version of the 8800GTS will fit you nicely (lots of places report that the 8800GTS is MUCH MUCH more powerful than the 8600GTS). The 8600GTS I got was sitting at $149.99 after mail-in. The cheapest 320MB version of the 8800GTS I saw was sitting at $269.99 (I don't know about rebates). Granted, my 8600GTS was significantly cheaper than most (most are around $180 - $220), so the difference in prices isn't THAT much.

Jam it back in, in the dark.