Stay away from Ultra power supplies. Efficiency is sub-par. Only 45A on 12V rail (less than Corsair 620hx) so you won't be able to SLI top end cards, which makes SLI pointless since you can just get 1 higher end card to do the duties of 2 medium cards, which then makes the SLI motherboard useless. Therefore, you aren't really saving anything.
I'm sorta exaggerating in that you could probably SLI top end cards but you'd be at the limit of the power supply at load, which is a bad combination with the less than stellar record of Ultra power supplies.