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I'm going to say, yes. T5's are worth the cost if you don't mind spending the money. Get an 8 lamp fixture if you can. To save a little cash and still have a nice system, go with PC.
Can NO T5 lamps be overdriven the same way a T12 NO lamp can be overdriven on a VHO ballast? If so, then there's an option to save money and get almost the same output at the expense of a shorter lamp life.
I haven't seen anything in any of my reading about being able to overdrive T5s. I would think the ballasts are different enough that you couldn't do it. From my understanding, T5's use a solid state ballast which doesn't generate noise or heat, unlike a T12 ballast which generates a lot of heat.