This is funny i had to make this same decision!!!! so what i did was i found ATI T5 (Best T5 fixture) at a good price and now im working on my sleeve tattoo, i can set you up with the guy thats doing mine. By the way the only reason that why i went with T5 is because i saw so many beautiful tanks under this light that to me its a proven fixture. The AI fixture seems to have way to many bad feedback even by member here in MR.
if you have the money i would go with the tatts but then again that just me im about to sale 36'' AquaticLife T5 HO 6-Lamp Light Fixture too. im getting 2 EcoTech Marine Radion. real soon.. here some pics of my tatts i got too sleeves done my left arm was done by David Sena and my right arm done by horisei from rising dragon i also have my back done it's an addiction..lol throw a pic of my tank too lol