First Indoor Closet Grow, What light should I get? PICS

So as the title says I am about to order my light, my area is 38" wide x 43" deep and 42" tall. almost a 3'x3'x3' space. a little bigger though. my question is should i get a 400W HPS or a 150W HPS, or a 250, the 400W is the best deal, and the 250 is only like 10 dollars less. i plan on air cooling the lights, and pulling/drawing a lot of air into the room, i hope temps wont be a prob. i dont think they will be. i planned on getting a 400W HPS but i just am having second thoughts. i plan on ordering this light soon and didnt know what i should do. its pretty much between a 150 and a 400 due to price diff. if i get the 250 i might as well get the 400 for only 10 more bucks. heres a pic:



its the bottom half of a closet. what should i do?

get the 400 watt, your REALLY restricted by height though, don't let your plants get too tall before flowering as they can triple in height then.

i plan on tying the plant down to make a bush and keep it under a ft tall. i want to build a second clone room

i planned on getting a conversion MH bulb, but i really want to build a seperate clone chamber. i dont want to always grow from seed start to finish. i would like to have a perpetual grow with constant clones moving in and out of this flowering chamber. i want to get a couple 125W 6400K CFL's they are 14" long and build a rubbermaid tub clonebox. that would rock. my investments just dont allow a couple extra 50$ CFL's and shit right now, just enough for the 400W and vent. i wanted to get 4" ducting and a 4" inline fan for exhaust. i wanted to get a batwing reflector and ghetto rig my air ducting to it with alum. tape or something. that way my lights would be air cooled. i think the heat would be ok. with ALOT of venting. a 80CFM fan would be ok right? connected to like 2-3' of ducting. i also am going to get an oscillating fan in the middle of the room on the plants and a 8" fan drilled upside down blowing air on the light on the plywood celing of the growroom as well. i think this will keep it just cool enough. i just dont want small buds because i have a 250W HPS