For what its worth. There have been several very long discussions on RC regarding the best ballast for Running T5. A lot of experts involved with a lot of experience. The general consensus among the T5 experts is that the Philips Advance ballast is the best on the market for running these bulbs. Also since they haven't been branded for the Aquarium trade they are also some of the cheapest.
I am running the 54W version of these myself. Here is a link to the 39W version if you are interested.
http://www.lighting-spot.com/icn2s39.html?fee=9&fep=1310&gclid=CJX2xb7d7McCFY81aQod3S4Nrg
I am running the 54W version of these myself. Here is a link to the 39W version if you are interested.
http://www.lighting-spot.com/icn2s39.html?fee=9&fep=1310&gclid=CJX2xb7d7McCFY81aQod3S4Nrg