revanche check out this website might save you some $$$

High Tech Garden Supply
High Tech Garden Supply

i would buy the biggest fan you can afford , you can get ducting splitters so you can add more than 1 item too it, with a cooltube you can go vertical in center of tent, check out shaggy's grow log he has a 4x4x8 tent with a cooltube in center of tent for test grows
High Tech Garden Supply

good luck