Thanks for the feedback guys. Going to America to do a big chunk of hour building is not for me because I think:
1)Its not really feasible for me as I need all work holidays to attend ATPL ground school next year
2)The point of hour building is surely not to just make the total columns in your logbook bigger? It is to get experience-I feel for me I'd rather fly as I go, doing hours while doing ATPL, building experience, and hours, whilst getting through D/L ATPL
Anyway, I dont think i'd like going to America to do 50 hours in a week or something crazy and then not afford to fly or have time to fly for the next 6 months. It may be cheap, but at too much of a cost for me I'm afraid.