It's going to be a high light setup so I need the MH's. They wont be on all the time. Nice thing about those particular lights is each kind of lamp has its own switch, so you can set up timers to run the 96W fluorescents all the time with the MH's kicking on mid-day for a "noon" daylight spike.
Chiller will take care of any heat issues.
Water comes out of the tap at like 95* down here in the summer, so tank cooling and temperature stabilization takes some planning.