For my eventual upgrade, I have a 6x39 TEK Elite fixture. It has fans and individual reflectors. The one thing I do plan on replacing are the ballasts. I will be swapping out the Workhorse rapid start ballasts with Philips Advance Centium programmed start ballasts.
I don't know a lot about t5 I just know for the most part they're plug and play and a lot of people have success with them. That's why I decided to use them for this tank.