I don't have experience with big tanks, but I've heard that ATI lights are great. BRS has some great videos about lighting (bulkreefsupply.com, click on BRS TV link)
If hung 6-10" above the water it should provide the necessary 300-400 par at just about any point in the tank except the sandbed. The edges and bottom couple inches of rock may not be suitable for most acropora, but the vast majority of the tank should be
BRS just put out an awesome video on it, kinda long but a lot of good information. Also if it helps this is the fixture I will be putting on my 180/220 (still undecided) sps upgrade in a month!