Need some fan advice (duct, inline, cheap, expensive) something quiet

So I'm planing to get my 250w closet up and running again soon, but I need a fan and there are too many choices. My setup: 250w digital with ballast outside the box Box is about 5 feet tall, 2 feet wide, and maybe 2.5 feet wide. These are liberal estimates and a fair bit of that is going to be filled with tubs (running an AERO setup). I don't expect I will be using much if any ducting. I have a simple bat-wing no cool tube, but I like to keep the bulb as close as possible to the plants so I want a fan that can keep the place cool. I need a fan that'll be quiet, though, as I'm in an apartment and share walls with neighbors. I'd also like to save money, but I'm willing to spend if necessary to get enough power and peace of mind. I'd rather not have my closet sounding like a bathroom fan if possible, but if those expensive inline fans won't do the job that much better for me, I may as well. So... simple duct fan? How noisy are they? or an inline Vortex, Can-fan, other? I was originally going to go with a STANLEY Blower, but if there are quieter options I'll go with that. STANLEY Blowers go for about $60 USD here in Canada

Huh... that post lost all formatting. It just went into one big paragraph. That's weird.

250 can be cooled with a lot less than a stanley blower and that will be a noisy bitch. If you want good you could get a solar and palau 6" can fan on a speed control, if you want cheap any 4" half decent squirrel cage fan or can fan on a speed control. Shit it could be cooled with a whole lot less if you had a cooltube, even diy cooltube if you really wanted quiet and cool at the same time that's the best way and getting any big fan and running it slow is the ticket to quiet.

This is a late reply, but here's a bunch of technical information that will help you make the right decision.
1. All fans make noise. The trick is how to trap, divert, insulate from, or otherwise attenuate the noise.
2. In-line fans can be really useful, because flexible, insulated duct (also know as acoustical duct) is really good at dropping out the sound of any good quality fan. In this case, good quality means that there is only high frequency noise (no rumble, or low frequencies) which is easy to attenuate.
3. In-line fans are cooled by the air running through them, so the noise coming off the fan casing (called radiated noise), can be blocked by enclosing the fan in insulation. Thermal insulation is also very good at absorbing sound.
4. You need a fan with some static pressure capability to pull and push the air down the duct. In most cases a static pressure of 0.5" water column - at the desired airflow (important!) is what you need.
5. A really inexpensive fan probably is not capable of blowing air under pressure (watch out for confusing and silly claims)
6. Brands: Fantech, Soler + Palau, AirScape, Ostberg... all good
7. A site with plenty of inline fans: http://www.hvacquick.com/products/residential/Fans/Inline-Fans