So 7950 would be the best single card to use? Or R9 270/x? Again, under 200W.
Leaning toward the r9 270 (non x, 270x really exists for no purpose besides making sales on stupid people) If you can find th 7950 at a decent price, go for it. As its out that 7950 is king of hash, people are charging so much for the card, even used.