Girl needs advice please!! Type of Fan, Size, and power for hydro cupboard grow...

Hey guys, Loving RIU and started my own grow... but needing a little advice.

o.k so i have a cupboard grow, 65x33x22 inches. about 14 or 15 square foot. please check my signature for pics of my grow room.

At the moment i am doing veg with 250 watt CFL and temps are nice and cool. 20C

In about two weeks am switching to a 400watt HPS for the flower.... temps are gonna heat up.

I am installing a 14 inch cpu fan for intake... but am not sure about what to do for pulling air???

should i get a squirrel cage fan and hang it from bungies? or an inline fan? I am only growing two plants and going to vent exhaust straight into attic, do you think i will need a carbon scrubber?? or would just an ona block/gel be fine?
Iwas thinking on bidding for this fan http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=260736921456&ssPageName=STRK:MEWAX:IT

i want it to be: A- not too noisy slight humm aint a problem and i can always add further insulation around things B- not be too expensive, will probably home make the carbon scrubber...

oh yeh my strain is BCN diesel, heard this strain can be stinky bud!

Much appreciated guys!!!!

just a thaught, get a carbon filter, get a 6 inch in line fan, then get a tmp thermostat. hook the inline fan to the top of the carbon filter, duck that out, then hook the tmp-1 to your in line fan. so now when your room gets to your set point the inline fan exausts your grow area. this will help in many ways. cooling, humidity, and air exchanges. id look on craigs list for the filter and fan. the tmp-1 is cheap 30-40 bucks. i use this method in my room, i have it hooked to a controller though,but your area is smaller so it should suit u great.