Over one tank I have 4xT5 with an LED stunner-type strip down the middle.
In it I use:
1xATI Aquablue Special
3xATI Blue Plus
On another tank I have just T5s with a 6xT5
In it I run:
1xATI Aquablue Special
1xATI Purple Plus
1xATI Actinic
3xATI Blue Plus
I probably get better colors from my T5 only fixture, due likely to its larger number and variety of bulbs than my T5/LED combo fixture, but I also do not get the shimmer that LEDs give. So, I highly recommend the combo. As you can see, as far as bulbs, I use all ATI, with a heavy reliance on the Blue Plus bulbs. Blue Plus is going to give you great color, and make provide the correct light spectrum for most of your corals to grow. The rest you can really interchange to your personal liking. I've used Geissman bulbs in the past with great results as well. I no longer get them simply because it's easier for me to just get all ATI.