MOST PSU's will work with MOST mobo's especially in terms of the type of components your looking at.

Its just the really old PSU's that have only 20pin motherboard power cables rather than the new 20+4pin (24pin) and 4+4 (4 or 8pin) power connections.

Both that you listed will work fine. 1200w is a huge PSU as well, what graphics cards are you planning on running?