Help me with the setup plz!

So first of all, I'd like to say sorry for my short posts, I end up asking one question and end up needing to ask 5 more.

My First question is,
I've been wanting to get a lumatek ballast, but not sure how many types are their or what types should I look out for? Switchable, dimmable or electronic? what types should I look out for? Is there a newer model that has less flaws? (I hear there is but I'm not sure what to look for to ensure that I get the newer model)

Second question is,
For the lumatek ballast, I thought I would get a cooltube, to go along with the ballast setup, I want to be running a 250watt hps in a DR60 grow tent that has the Dimensions: 23.5" x 23.5" x 55"
I feel that this 250 watt light in a cool tube or aircooled reflector would be idea, somone recently said in one of my posts that a cooltube will lead to light being lost vs an air cooled reflector.

I'm having trouble finding truth in the matter, since my cabinet is only going to have the Dimensions: 23.5" x 23.5" x 55", I should get an aircooled reflector, that will be able to fit in my tent.I'm having some troubles finding one

Also, I'm having troubles finding a fan that is silent, as I don't really want to order pandoras box just to be stuck with the whistling sound of a jet engine in my closet. So what fan is quiet that can suck / blow through a carbon filter suitable for the Dimensions: 23.5" x 23.5" x 55" and out of an aircooled reflector, and out of the room?

Any help would be greatly appreciated, I took considerably more time composing the post then my last several posts, I'm hoping to get some good helpful advice on setting this up.

Have you checked out htg supply? They have a number different ballasts, cool tubes, and other lighting needs.

First off, I would strongly suggest that you stick with a magnetic ballast. They are half the cost and less prone to failure. It will take the life of the electronic ballast to recoup your additional cost.

The fact is that glass absorbs lumens. If cooling is a problem then you will need an air cooled light and cool tubes get rave revues. But the glass does absorb lumens. Nothing is perfect, you have to use what works for YOUR setup.

All fans make noise! If you want a silent fan then you need to get a larger fan than you need and slow it down with a Fan speed controller. You will be amazed at how quiet that loud fan will become when you run it at a slower speed.

is there a fan/filter setup for around 100? that would be adequate for the room?