thinking about what Shad said ... he is absolutly right about the fact that David uses T5's. and with what you want to keep they should be just fine as long as the sps corals are placed in consideration of their specific lighting requirements. most sps will ok uder T5 lighting or VHO like mine but there are the one that absolutly MUST have the MH's.

I am with Dave on the metal halide is the only way to go. (if you can afford them, and want to do it right). if you can afford them, get them. because you will probably want to upgrade to them later (like i am doing soon). better to do it right the first time, then to spend more money later to get it right the second or third time.