>
> The PIC 18F parts with onboard USB seem to be a very good fit (simple
> USB design, decent performance, good amount of memory, very cheap). Am
> I missing anything obvious as to their pitfalls?
>
>   
They are pretty good, bear in mind though that the USB stack (at least 
microchips one) *will* dominate the structure of your code. This may or 
may not be an issue depending on what else you want the pic to do.
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