660cfm 6" tjerlund fan $100
550 cfm 6" Phresh filter $180 (for the smell)
Various flex pipe $30
Ok, so thats what im using in my room. 8'x9'x7' total feet. My room temps stay rock solid, and havent had to worry about smell for a moment. I know the fan im using is kinda big, even for my 1000W, but Ive always bought big to start, so I can grow into it. I would imagine with the big fan setup im using, you could probably run 2000watts in there w/o any problems. Once I get the hang of MJ, i will probably invest in another 1000w fixture and put them on movers to FILL that room! Expensive for sure, but I tried the cheap diy methods and it was such a pain in the ass for such poor performance. Hell, you want to grow a crop worth near a grand, might as well spend $500 and grow 4 of em.
Just my two cents, coming from a cheap ass do it yourself'er. best of luck to ya.