I have been running 2x54watt T5 and 4x65watt PC, I have good a good growth rate IMO with some easy SPS, tons of zoos, rics and other softies and a good number of LPS. It is also enough to keep a derasa on the sand bed of my 90g. My montis and other SPS are not as bright as other tanks, but they are not brown and have a good ammount of growth.
Just thought I would add my .02
I want to upgrade to 4x54watt T5 and ditch the PCs, maybe add a 2x110vho in addition to the T5s.