Right now my ventalation is a little ghetto a recirculating fan moving air around in the closet and a household room fan to exhaust air out the closet , soon the ventalation system is going to be updated with a cooltube, and a inline fan.

The fan im getting is gonna be Hi-Tech Garden Supply

Nice and cheap and will do the job,and Ive ordered from them before there quick and stealth.

Its fine to have a fan with higher cfm expessially if you plan on using something like a carbon filter (to minimize smell) thats going to lower the cfm rating. Its always better to have a high cfm rating.