Bristsol GS for the groundschool. They are undeniably the best in distance learning, arguably one of the top places to get your ATPL's in the UK.
Ideally, you want to do your training European airspace if that is where you are going to be working. It may seem more pricey, but by the time you go and get a foreign licence and convert it can all add up. If you want to do the JAA training in the US with an approved schoo, then you can, but it may have slightly less face value on your CV then having done it in Europe.