you could just buy this: http://www.wormsway.com/detail.asp?sku=MT118
it's about $120 including shipping

and this: http://www.plantlightinghydroponics....er-p-1558.html
it's uder $100

with a 1kw hps the best thing to do, if you are trying to use it in a small space, is to buy the best possible cooling equipment as you can as to insure that you will not just be wasting you time with a space that's way to hot for growing. with that exact fan and tube i was able to have a 1kw hps in a closet that was only 4ft wide by 22inches deep by just under 7 feet tall with temps never exceeding 81F. of course the ballast was not in the closet.

your next problem is going to be lightproofing that closet. try hanging a thick dark colored tapestry or curtain over the outside of the closet door(fabrics inside would be an extreme fire hazard) and that should help. you can also get some weather stripping and put it around the door and casement to futher help block out the light. good luck.