I recommend the active air inline duct fans. The 6 (400cfm) or 8 (720cfm) inch would work for you. I use one of each Go for the 8 if you plan to upgrade. I also bought mine at a mighty hydro, a grow store and over paid. I could of bought it online for $40 less, online at the right store you get free shipping too. The vortex is a lot more money for a little more cfm and a 10 year warranty instead of a 5 year warranty.

active air 6 inch | eBay