PIC18F04/05/14/15Q40
You won't be programming those with PBP.
If you're sticking with PBP, make sure you pick something that's supported, since a lot of the newer chips aren't (and won't be).

Has MicroChip come up with a newer better USB series than the 18F2550/18F4550?
In the 18F family there's the 18F2xK50/18F4xK50, but that's about it. They're pretty similar to the 4550, just a bit newer.