HF has the little "Blaster in a box" deal with the gun and container which will do a diecent job for what your wanting. No sense getting a pressur pot unless you plan on doing a lot of blasting.
I got one of the metal seperators/regulator units from HF and mounted it to my pressure pot. The one you get with it is POS and I use a paint gun bulb filter going into the seperator. I've use my a LOT lately and moisture has been no problem. But, I do have a good piping set up in the shop too which is a big help but you'll still get some moisture anyway during summer weather down South..