I can't quote you a price as I did my PPL here in Ireland. But, there's probably a couple of things you can do before going out to the States. One thing to do would be try and have the exams done before you go out, or at the very least be ready for them with all the study done. Remember though if your going to the states it'll be under the UK CAA so you'll need to do their exams.
One thing that might be worth your while doing, is joining a club here first and getting a few hours under you belt before going out. You might not be under as much pressure when you go out there and it's a chance to figure out whether flying is really for you or not.
Another benefit of doing the few hours here is that you'll be well established in a club here and it might make it easier for you to settle into flying in Ireland. Chances are you'll be expected to do the same couple of hours anyway to get checked out if you arrive into a club here with your fair weather license.
In hindsight that's the way I would have done it. In the end I stuck it out with my flying club(glad I did in a way). The only down side to it was that it took so long nearly 3 years, but I could have got that down to a little over a year I'd say if I'd put a bit more pressure on myself.
Just one final point, I did my PPL at a flying club and not a school, Limerick Flying Club to be exact. From my experience and bank balance I'd high recommend joining a club over a school. Taking into account every single expenditure I had from my initial membership to LFC, my flight log, exams(including flight test), 55 flight hours, the whole thing cost me 7960euro. My average flight hour was just over 100euro/hr(130e and later 140e per/tach hr). These kind of rates will make hour building much more affordable than the 180e the flight schools look for. Having done about 20ish hours in the Pipers/Cessna's I much prefer coming back to the Tecnams especially for potting around Ireland and they're so much cheaper to operate.
Anyway best of luck with whatever route you end up taking. Happy flying.