Ok I have almost purchased everything I need I had a budget of aorund $1,500.....dr-150, 600 watter (got a 400 already) couple oscilating fans, inline exhaust fan, carbon filter, nutes soil, ducting everything....I have a $400 left,,, since I'll be growing in a 5x5x6.5...should I go for a co2 system, I have 20 lb tanks already..or with a prtable AC unit...??? Any help would be appreciated...