Go for high bin Cree XPG's or Luxim Rebels. The best bins have the lowest variance on the 6500K color. As for drivers, someone on reefcentral made a DIY one which drives and dims 3x6 led
sets at 700mah each. They cost around 15 each or less to build. As for the blue LED
's go for CREE XP-E Royal Blues. On the note of LED
's from random china brands, usually 5W and 10W leds are junk with high degradation rates. The CREE leds degrade 5% per year, while the china brands may as well as being off color, have 10% or even higher degradation. I've researched long and have found the XPG with optics or Rebels with optics the best.
The drivers are easily controlled with an arduino and their is also a 2X8 3W led
driver. The arduino can allow functions similar or the same as the pacific sun with enough coding.
If you rather not DIY the fixture, these brands are the best I know of.
Pacific Sun-High power using brute force of 1W led
's. Most advanced with seasonal and lunar cycles, and temperatures of each. Weather effects and bluetooth. These cost around $1000 each with slave units being cheaper.
Maxspect-Good amounts of PAR equal to a 250W halide. The spread of the fixtures is 2X2 feet. The cost is around $500 and $700 depending on size. They cannot dim but have 3W semileds and 30W off brand LED
's. The power supply has timers for the 30W, White 3W and Blue 3W.
Aqua Illuminations-Crazy PAR but with less spread versus the maxspect or the pacific sun due to optics. Its spread is around 2FT by 1Ft. The light uses CREE XPG and XRE with a 2:1 ratio. Their are a total of 24 LED
per fixture and have dimming and controlling. It is basic controlling with color spectrum change and on off times. At over $600 each, they cost almost double than the other 2 options. They do however put out around Double the par or more. These are the only US based LED
lighting due to their licence with orbitec.