I have a nova extreme (not pro) 48" over my 55gallon tank, and I like it just fine. It's not the greatest light, but the addition of the contoured reflectors should make it a fine light. The quality of the housing itself is very nice, I did have a problem with one of the plastic legs, I snapped it off moving it once, but it was entirely my fault. The plastic cover also got junked up with salt so bad once that I had to partially disassemble the fixture to force it out, but regular cleaning, and running tops over the tank, would help greater.
I would also look for an 8 bulb fixture, if it were me, if nothing else but for the depth of the tank, but running 4 bulbs over my 55gallon worked fine for everything I threw at it. I would have likely ordered another Nova Extreme for my 90 if I had not had a retrofit canopy.