[machone]

First welcome to the forum!
I use a 4.5 HP 26 gallon compressor that works fine for now. I will be needing an upgrade at some point in time, but only because I'm turning this into a business.
At this point, I'm using an old kitchen oven, An IR light for larger items, and am in process of building a 2x3x6 upright oven. An IR light works ok, but not very cost effective.
I use the Caswell hobby gun and it works great. But again, because of the business, I will be upgrading to the pro gun soon.
So it really depends on what you're using the equipment for, yourself or business.
Hope this helps.
mach