Question about fans

Hi every1, first time grower here Im really excited that my baby sprouted last night and withing about 12 hours its grow 3 inches!!! Anyway, its a closet grow, 1 plant, i have it in a box thing i made, i am just wondering....Should i spend 100+$ on an inline fan? Or would it be better to spend about 30$ on a duct booster fan? Oh ya, almost forgot to mention, im currently using a 90 watt ufo, and im planning on adding abot 120 more watts of cfls for budding time, so heat shouldnt be an issue. Thnx for any comments

spend the 30 better

i'm using a $30 duct fan for months, and it seems to be working great...

Post pics. And I'd use the booster since heats not an issue and there isn't a lot of air to move.