tent 6" or 8" ventilation?

Well you could get a 440 CFM fan for ~$75
http://www.amazon.com/dp/B006OQTY6U/?tag=chrome-purchreview-20

or you could get a 720CFM fan for another 25 bucks which I would think would be best, you're spending another 25 bucks to almost double your CFMs.
http://www.amazon.com/Output-In-lin...F8&qid=1362972110&sr=8-10&keywords=inline+fan
or
http://www.amazon.com/Hydrofarm-Active-Air-inch-In-Line/dp/B002JQ4K1I/ref=pd_sbs_lg_1

And, if your hoods are 6 inch and you want the 8 inch fans that's no problem. Just go to lowes or home depot and get yourself a 8 inch to 6 inch reducer and you'll be set, that's why I'm doing right now. I just couldn't spend $75 on the 440 when the 720 was only 25 more

Yea I'm pretty sure I'm gonna go with an 8" system so I can hopefully run everything on low and get good airflow. I will have to figure out how to fit a 24" filter, 2' x 3' reflector, and 8" inline in a sound box in my tent with as few bends as possible.