Thanks for all the suggestions! I've been looking at what kind of bulb options I would have with each, and have a few more questions. My current tank is 75 gal with 315W of light mostly 6700K, with some 10,000K. I really like red plants and have been reading the various articles here on how to achieve nice reds. That said, do I need to make any special bulb considerations with that in mind? Also, I have found several bulbs labeled "plant grow" but they don't list a color temp for them (they have a strong pink/red glow). Has anyone ever tried those?

JDowns - Why the strong preference for T5 HO over PC? Do you think the light penetrates the depth of the tank better?