Ok. Well, I'm no expert by any means so I'll just relate what I've done in the same size tank. I have 130W of PC over my 20. T5 light is more efficient than PC and MH is more efficient than T5 so the wattages will vary. With my setup, I started with softies and very easy LPS. I've since found through pushing the limits in baby steps that I can keep just about any LPS and alot of SPS. There are corals that I can't keep and I've avoided trying to take a leap. A lot of it will depend on other factors such as nutrients, flow, placement, etc. For your desires, I wouldn't recommend less than what I'm running and it'd be pretty easy and relatively affordable to do even better.