Rapidled.com; if u think you can manage a bit of soldering and a multimeter this is the place for you. Also try reefledlights.com, but I feel its a bit more expencive although he's located in Chicago.
Carefully plan your setup. Dimmable? What kind? PWM or 10 v system with potentiometers. Do u plan to use contollers? If u dont plan or design ahead; the project becomes more expencive.
How bigs your tank? What do you plan to keep?
I like meanwell drivers, 50/50 crees royal blue to white with dimming potentiometers. Very easy setup.
Pay more attention to keeping the unit cool. I unplugged my heatsink fan and came back 6 hr later to fund 8 burned out LEDs.
Research and goodluck.