Not sure why you're paying $180 for a 6850 when it costs $150 for a 6870 (also with free Dirt 3 copy).
The 6870 has a few more cores (the 6850 has a block of the GPU switched off so only has 960 shader units, not the 1120 of the 6870), runs at 900Mhz rather than 775Mhz, and has memory clocked at 4.2GHz rather than 4GHz. The 6850 you selected has 2GB of RAM but that isn't going to matter with the processing power you're looking at (turning things to Ultra detail aren't an option for either card, and at this value segment you want as much processing power as you can get).
Grab Steam, check some of the Free2Play stuff, wait for the sales, and generally buy anything that catches your attention as long as the reviews say it's a good port or original PC title (places like RPS, which focus solely on the PC, can usually tell you if the PC version is butchered by publisher indifference; it is worth grabbing a wired 360 pad for games where the joypad controls are ideal and they never managed to figure out a good mouse/kb alternative).
Edit: Oh, and GOG.com have your back if you're looking for some older titles to see what PC gaming of old was about (if you've been console gaming up to this point). Also indies often use the older genre forms from PC's past as jumping off points for their games so having a working knowledge of the older stuff can help guide your hand to grabbing indie titles that fit your tastes. There are a load of bundles (Humble, Indie Gala, etc) that give cheap access to indie hits if you keep your ear to the ground.
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