i just got a couple 120mm computer fans, they are about 55CFM each, but they are the quiet type, so i dont know if you could get a higher CFM out of a 120mm fan.

i've always herd that you want more fans on the intake side the the exhaust, but i dont know if that was because of cooling or just air circulation.

what type of CFL are you using? I know the 3000k bulbs add a decent amount of heat and the 6500k shouldnt add very much heat and if your vegging at this point then you want bulbs with a high light temperature(cool white)