I agree, 2-250 watt halides with the T5s should be plenty. Lumenarc reflectors would give a more broad coverage. Lumenbrights give deeper penetration into the tank. With the later, you would need to mount them at least 14" above the water. Keep your lighting in mind when designing your canopy.
My Reef System: 215g Brick 72x24x29 Dual Overflows | 4x 250w MH | 4x IceCap 39w T5 w/ Actinics | MSX-250 Skimmer | 1/3hp Chiller | 16w UV | Aquacontroller 3 | Lunar Sim | AquaSurf |Tunze Wavebox | 2x Tunze Stream 6101 | MRC Dual Nano Calcium Reactor | GEO Kalk Reactor | Pan World 150PS Pump | Phosban & Carbon Reactors