If you go down the FAA PPL route as I have:
You must factor in the cost of a Restricted Radiotelephone Operators Permit. Its only $80 and as far as I can remember doesn't run out, but you need it to operate the radios legally outside the US. Also, do get your JAA RT licence either before or after you get back as there is a big difference in the use of radios. Its much more formalised here in Europe!
If you choose California near the coast then get the time of year right, the Marine layer can and will cause problems for you. Usually May and June but as always can be early or late.
PM me if you have any questions. Good luck!
Craigyd