I am not 100% sure but I think nova and outer orbit might be made by the same company...If so I can tell you i love my outer orbit hqi/t5 combo!
Everything I have read says you can keep corals with t5's as long as you have enough wattage t5 but I am a personal fan of metal halide...I love the shimmer and would highly recommend them!
Depending on your tank size...If you get something like a 250w hqi/t5 combo you will be able to keep just about anything but would need to know tank size to be sure, general rule of thunb seems to be 2' per HL.