T5's are really gaining popularity. I use a combo of T12's, CFL's and HID's. One day soon, I'm replacing my HID's with T5's.

Check out some aquarium lighting for other spectrums too. You can get some bulbs specialized for growing like for example:

Wave Point Coral Wave Coral Growth Accelerator HO T5 Aquarium Lamp at PETCO

Have you ever heard of doing a PAR grow? People are getting incredible results going that route.