Ok, so I'll stick with the fluorex. Those evidently have very little heat for the light they put out. As for the HPS, if i did go that route, it would be months away (as i am starting from scrach), so I can plan that part better.

I do have a question about ventalation: As this cabinet is dual chambered (two vertical sides), would I need to vent both sides, or just create two holes into the upper chamber and vent out all at once? (I am thinking two set's of vent holes (one intake, one outtake) will be needed; one on each side. Correct me if i'm wrong.)