Was just about to post, when I realised the Clear has posted something very similar. Similar, but not identical, so here goes:
I wouldn't go to the US for hour-building. I love the US, and I loved flying there. Problem is, there are so many good schools in the US that there's a reasonable chance you'll get to do some flying there anyway. So, if I could do it again, I'd use hour-building as an opportunity to go somewhere where there are fewer, or no, schools, in order to get more variety. Top of the list would be Canada, South Africa, or possibly somewhere in South America.
FFF
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PS - Silverknapper, I think you're being a bit harsh on sgarvey. He's started some pretty appaling threads, we all know that, but this one actually has the chance to be very interesting. It doesn't concentrate on any one aspect of the training, and I'm looking forward to some varied answers, which hopefully we'll all be able to learn from.