Need help with filters!

I have just recently purchased some new painting toys(LOL) and I need some advice on what kind of filter I shoud get for the air line. I'm just painting as a hobby for my cars. So I don't need anything real expensive but I do want quality work. I've seen both oil and moisture separators. Do I need both? What brand is best?

if your wanting EVERY thing out of the air line accept air, i would recomend a desicant bag filter plus an oil and water filter.