In my opinion, Secret Jardin (Dark Room II) grow tents seem to be of really decent quality. I've come across really cheap generic grow tents on ebay, but think I'd rather pay for quality instead of having a cheaper tent go kaput on me!
. This is not to say that they are better than MH/HPS, because those still remain the best in terms of output. But flouro lights 8s and 12s are significantly less expensive and produce a hell of a lot less heat.
found that the cheap (35) exhaust fan I rigged up threw out enough heat... well my plants are all over two feet and still going strong so I am assuming that enough heat is leaving the tent.