I'd listen to B2N2 and do your FAA PPL. I did a CAA PPL with UKFT back in 97 and I couldn't fault them (mainly because I had a good instructor) but you have got a handful of schools in the States aimed at Brits coming over and they know once you are there you're committed. You have got hundreds (possibly thousands) aimed at Americans and these wont survive if they are not up to scratch. Americans wont put up with it! Plus you get your night rating with the FAA PPL I believe.