I have a 155 non-bow that is the same depth.
I was running 3 150watt HQI's and 4 96 watt PCs. The PC's were actinics
It was fine for LPS, softies, clams and anemones (kept up top). As for the clams one is in the sand and the other is up top in the rocks and both are fine. SPS is fine as long as it's kept up top. I kept my lights 5-6" off the water.
My tank had SPS up top, then hardier LPS and miscellaneous polyps and zoathids, then more LPS and softies (especially mushrooms and ricordia) and the bottom had LPS (mainly acans), non-photosynthetics and mushrooms/soft corals
I just upgraded to 3 250watt MH's and there is a HUGE difference, but the 150's were fine.
Is your tank a 6ft long? If so, I think you need another halide unless you keep all your high lighting demands under the two lights and up top.