PSU... why so? The 5830 has the TDP of 165W, while the 7870 is rated at 175W... that might cause problems, but the 7850 is even lower, 130W, while giving the 6950's performance...
I wouldnt touch the 69xx series, as they were reported noisy and they eat a load of energy.
Btw i have a "true" 955 in an other computer, and not so impressed with it. This flashed crap can reach 3.8GHz at stock voltages if needed while the true 955 cant do more than 3.4. I had luck, im happy with it.
As for the Intel, while its clearly, way superior to the AMD, its also super expensive here. A fluffin i5 2500k costs 55-60K Huf, whats about equal to 250-280 bucks, let alone the i7. Same with the motherboards.
I dont have money for a new puter, and only barely enough for a 7850 if i want to buy a good stick too (what i may have to live withouth haha).
Let me rephrase my question, would that be enough for AH in a triple head, full-hd or 1600*900 setup?