If you're going to go to the States (And you really should!) - don't bother getting a CAA PPL - you don't need one. An FAA Private would be much quicker, easier and cheaper. (One exam vs 9 exams etc..)
I would also suggest you consider getting a 2-4 year training visa and working there as a flight instructor - in all likelihood you'll be able to get a job flying for an airline in the US. If you try that in the UK you'll spend twice the money to get 1/4 the possibility of finding a job...