[Livinincolor]

The questions you ask all depend on how much you will use the system and how big the items are you will be powder coating! If you plan on just doing a couple parts for yourself, it wouldn't make a lot of sense to go all out and buy the best units available. This will be a tough decision on your part.

When it comes to an air comp., buy the biggest you can afford and that will fit your needs. That sounds ambigguous, but that's really what you need to do. We use a Sears 30 gallon that works well for us, but we may need to upgrade in the future because of our sandblast air needs. When it comes to compressors, more cfm at lower pressure is better.
As for a sand blaster, we are using a hand unit in free air at the moment that does what we need it to, but we are building a PA Blaster with a special gun from Rob that we think (and hope) will operate more efficiently. I wish we had the room for a blast cabinet
When it comes to guns, but a Caswel unit!
Ovens, build one or buy one. Building them is a big project, but not insurmountable! Plus we have a smaller home type oven that has been modified with better temp controllers and thermometers. Commercial ovens are very, very expensive and not easily affordable. Another choice would be to buy a commercial restaurant oven, they are bigger, cost more,but we were able to find a large convection oven that works very well.
Hope that answers some of your questions, keep reading the forums!!!
Mike & Johnny
Sho Me Coatings