I'm running a t5 system and love it. (160 bucks, with four 4' tubes -- 20k lumens total 54watts per tube)
4' X 2' area for your plants rocks. So much space, and uniform light. Minimal stretching, and the plants stem seems to grow straight up as opposed to a lot of other pic's I see here to where the plants are almost growing sideways trying to find more CFL light.
My whole thing was, if I'm going to take the risk to grow this shit, I might as well do it 'right'... No mickey mouse shit for me. Do it right and do it once.