Ballast Question

confusion confusion...
ok, so i have a 400w mh universal bulb from GE
but i don't have the proper ballast to power it
and i am confused as a motherfucker as to which will work for me
(obviously the cheaper the better )

this specific oneVVVVV
http://www.google.com/products/catalog?q=mh+lights+for+sale&hl=en&safe=off&client=safari&rls=en&prmd=imvns&bav=on.2,or.r_gc.r_pw.,cf.osb&biw=1280&bih=577&um=1&ie=UTF-8&tbm=shop&cid=1868569583784220416&sa=X&ei=gkfNTviCGYaltwfZtJHlCg&ved=0CHgQ8wIwAA#ps-sellers

indoor section and no one knows about mh ballasts? :/

well i have a phantom digital ballast and it is the shit will run any bulb u put in it cost me 200 for the 400w and 250 for the 600w, cheaper will cost about the same an Xtrasun convertible magnetic ballast will cost 179 bucks, and a regular MH ballast will cost 129 bucks. you could also get a reflector with a ballast built in it for 200 400w

word up, i guess what i was looking for was mainly brand names and shit like that that will surely work with the bulb i already have
thanks for the info