Great suggestion from above. Either would be fine but if you want a true custom set up, I would do T5s as supplements and LEDs as the mains. That's a good combo as most agree that the T5s make corals pop and bring out their true colors. Both will provide excellent lighting. Also, the LEDs can be dimmed if needed.
6 bulb ati sunpower is perfectly fine for those dimensions. I asked this question to the zeoheads that use predominantly t5's and supplement led's for the shimmer if you like that