Do you intend to crossfire in the future? If yes, that mobo will bottleneck another 6850 coz it runs in 4x mode. Get this Asrock mobo instead:
ASRock 870 EXTREME3 AM3 AMD 870 SATA 6Gb/s USB 3.0 ATX AMD Motherboard http://www.newegg.com/Product/Product.aspx?Item=13-157-...
Everything else seems fine.
Why would it be dumb. LOL. Anyway, thats a good resolution. You might indeed make good use of a single 6950 or 2 6850s.I suggest, you get 2 6850s for that. I understand, it would go over 800$. But then thats upto you. I suggest you could go with one 6850 now and the get another one in 6 months. Mind you, at that resolution, you will need another 6850 in 6 months for sure if you want play everything at max settings. So, errm, dunno. Go with a single 6870. You can get away with a single one for a year maybe. So, there are your 2 choices:
single 6850 now but will need another in 6 months(est 175$ 6 months later)
single 6870 now but can get another card after a year(est 200$ 1 year later).
GL and hf
I would start with a single card, and expand later if you have to.
AFAIK, Hec is not known for quality PSUs. For a single card, 550W-600W will be enough. Antec, Seasonic, Corsair, XFX, and Enermax all have models in that range that have received excellent competent technical reviews.
I noticed you're planning on keeping your DVD drive. If you do decide to go with the AsRock Extreme3, make sure your drive has a SATA connection, because AFAIK the AsRock 870 Extreme3 doesn't have the old IDE/ATA port. Made that mistake myself and was forced to switch motherboards. I was still researching parts at the time, but I'm just glad I caught it early.
If your drive does have an IDE connection, you can buy a SATA DVD drive for <$20.
For PSUs, the usual recommendations around here are PSUs from Antec, Corsair, Seasonic, and perhaps Xigmatek. There may be some other companies I left out, though. I'm not too sure about HEC's PSUs.