I think that you're doing the right thing by painting. Powder Coat is expnesive and if you ever do need to do frame work on the bike you need to chip that crap off, where you weld. With painting just use a good sealer before your shoot your base coat. That will keep the frame protected, for years to come. Consider also using expoy primmer, just because that crap is harder then crap to sand, and very chip resistant. Good Luck!
-Matt
-Matt