Hey man, did some research for ya.. what's your budget? I figure it's pretty economical, so I found something that'd work perfect for you.. You need a fan that can run at least 82CFM (that's your CFMx2), so.. the new CAN2600 has great reviews so far and can be had on amazon for $52 bucks shipped.
Check this out..
http://www.amazon.com/SE-Electronic...60456560&sr=1-1&keywords=fan+speed+controller - $20, this is your controller
http://www.amazon.com/gp/product/B00557SXP2/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER - $52 shipped, filter.. nice and small too.
http://www.amazon.com/gp/product/B001IMG4UE/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=ATVPDKIKX0DER - $10 shipped, 4 inch flange
http://www.amazon.com/Output-In-lin...qid=1360456654&sr=1-10&keywords=4+inch+inline - 53$ shipped, this is your fan brother..
So $135 all said and done. In my experience man, the extra $40 investment will pay for itself when you don't get caught. I've been caught and it wasn't because of smell, but getting caught is hard on you, your family and those around you regardless. There's a stigma with growing pot man. Those who don't do it, don't understand it. If odor is a concern, don't cheap out. Ever!