Yeah i wasnt sure about the PSU. So a 1200 watt would probably be better. What other mobos do you suggest? I've built plenty of gaming rigs in the past but this minning rigs are new to me.
1200W is still overkill I would say, but sure. 1000W would be what I would buy - look up the RM1000 from Corsair. Good quality gold rated PSU, pretty cheap because they skimped on the gimicky extras like pretty cabling, packaging, and velvet bags.
Asus Z87-A is a decent board for a good price. Can run 4 cards without issue (never had luck getting it to detect a 5th tho). A lot of this stuff comes down to availability tho. See what you can find for a good price that is actually in stock ready to ship, and then search for info about it.