Personally when I looked into the USA option I didn't find it held that many benefits financially. Sure, the weather is more stable, but take the £2k you save in training, then subtract your flights there/back, then your little visit down to the US embassy in London for the visa interview, all the hassle associated with it... your cost saving soon disappears.
I decided to press on over here and got through in 45hrs exactly, flying 3 or 4 hours per week in spring 2006, which was appalling weather-wise. I was fortunate in having a flexible job, and working only 10 minutes drive from the airport. Book a lesson every day, some weeks you'll get 1 or 2, some 6 or 7.
When I did some fag-packet maths on the figures after I passed, I reckoned that going to the USA would have saved me less than £500, which I would quickly have spent adjusting to the UK weather and flying conditions. For a CPL/IR sure, get packing, but not convinced of the merit when it comes to a PPL.