Like duck, I own and prefer Vortex. Mine has lasted years and years, too. I do have and use 6" fans for 600W and 1000W lights--150W up to 400W I use a 4" fan. Do not get a duct booster fan. Even though many sellers sell these as exhaust fans, these are not meant to be stand alone fans. Get a decent centrifuge type fan and use it to exhaust air out of the space, rather than blow air in. I also usually recommend a fan speed controller also. You want to exchange the air in your space at least once every 2 minutes or so. However, more does not hurt either. I like to exchange the air in my space several times a minute.
A 600W light is only good for a max of about 16 sq ft, so if your space is larger (you talk like it is an entire room), you are going to need to get a dedicated space set up that is no larger than 16 sq ft. A tent can be a nice solution. Your individual setup will depend on the ambient temps and your own individual climate.
Like Rosebud mentioned, always have a spare bulb hanging around. I prefer T5s for vegging also, but am using a 400W MH now because I am using one of my T5s, have a problem with one of the others, and have 1 out on loan to a friend.
