Lighting Choice - SPS

[Scales]

I need some input for a light purchase....I have researched lighting for my tank upgrade....likely to be a 180 (72x24x24), 3 sided viewing "format", SPS tank requiring 3 MH lights (I plan to supplement with (2x) 6 foot VHO Actinics). I currently have a PFO system (2x250W)...one of the 250W will be used to light the area of the tank with the overflow and wavebox (the other 250W will be used on a small clam tank beside the SPS tank).

For the remaining two MH lights, I have tentatively "decided" on a dual PFO 400W HQI ballast running SE 10K Ushio's...I concede that I am no "expert" in this area, and while researching found my brain going numb from the comparison studies/arguments...information overload....

I know there are many whom possesss far more insight into this area....so critique away....before I purchase something that I will later be told was a bad idea....

Cheers.