If you arent set on the 6950, I would recommend an Nvidia 560 ti instead. They benchmark very very similar and cost about the same, but, the Nvidia card will always have better drivers, and more features. Unless you want single card eyefinity, the nvidia has a better feature set, and gets a bigger performance boost if you go SLI in the future. (you'll need an SLI rated board though)
While the 6950 is generally only about 2% faster than the 560Ti(Slightly faster for pretty much everything), it can still unlock the a 6970 and OC nicely. Also, Nvidia's 5XX series scaling is flax compared to HD6XXX cards in crossfire.
But yeah, drivers.
Also, refer to this for up to date buying guide stuff. Not the best, but a good start.http://www.tinyurl.com/falconguide/
Lastly, POWERCOLOR ARE YOU KIDDING MEEEEEEEEEEEEEEEEEEEEEEEEEE