I hope you realize that you wasted a lot of money right? You could have gone with the 5830 @ 130 and still done way better or by waiting you could have received an even better deal. The only argument for getting the 6970 is because its going to be a part time mining rig part time gaming rig and its clear those wont be used for gaming.
I disagree, one thing I also check for is resale value. A 5770 is a good miner per cost, but you won't make anything back selling it. A 6970 will have awsome resale value. I sincerely hope that bitcoins really take off and I'll never sell my mining gear, but if I have to my 6950's will still sell at decent prices.
This wont happen. The only sensibly approach is to get 6970 then sell them when the 7xxx series comes up BEFORE the resale value drops too much. No sense in sticking to them when the 7xxx series is that much more efficient.
Resale value is one reason I went for 6970s.