Fishneedit has 150w MH pendants for $140 each, so you're talking $560.
Reasonable is definitely the operative word. $560 may seem like a lot for lights, but it's almost a 600g tank...it's gonna be pricey.
I take back my previous comment, this is an interesting question. I started thinking about a tank like that, and what I would do as far as setup:
Filtration: Drill the bottom for bottom filter intakes. Then go with 3 or 4 Eheim 2080's at 450 gph. I'd probably end up with two of the huge Koralia powerheads at either end of the tank too.
Lighting: 4x 150w MH, and I might even throw in some T5HO's too.
Heating: 300w Hydor Inlines on each of the eheims
CO2: Pressurized, obviously, with inline reactors on 2-3 of the eheims
Substrate: Eco complete or black flourite...something you won't have to replace cause that would be a pain.