Lived in the UK all my life and I must say I wouldn't want to live anywhere else.
The south coast is the most affluent, and most expensive, but you gets what you pay for. Up north it's cheaper but the cities tend to be a bit run down and industrial. Get out of the cities and the countryside is nice.
London is great for nightlife but a bit of a rat race and very expensive.
Only place I would like to live outside the UK is north Sydney in Aus, up where they film Home and Away. Now that is a fucking lovely place
(exeprt for the spiders)
Been all over the world and the Carribean is nice, but for a holiday only. In Europe Prague is great, as is Amsterdam and Copenhagen.
Been to the USA numerous times, and its so bloddy cheap, the people seem friendly enough but no the place has no culture at all. I was in Boston and the taxi driver pointed out a building and said it was two hundred years old. My home here is over 400 years old!
Another thing is of course you haven't got to learn another language, but whereever you go, how are you going to stay very long? 6 months working visa? Illegal immigrant?