Sorry Fab,
Unless I'm mistaken, you haven't actually asked a question - unless the reason for your post is for others to give their ideas on your outline training plan. (?)
Are you doing the JAA PPL in France?
8 months sounds very tight for the ATPL's, certainly with the available studytimes you are considering.
States (don't forget Canada - Harv's air perhaps) is fine for hourbuilding, nice and cheap....but you are wrong - the only requirement to commence CPL training is 150 hours. HOWEVER to be issued with your CPL you must have 200 hours total of which 100 hours is Pilot in Command.
Schools to recommend for further research:
Bristol Ground School ATPL
http://jals.co.uk/bgs/ Atlantic Flight Training
Professional Air Training
Airways Flight Training
Stapleford
Oxford
Aeros @ Gloucester
Bristol Flight Centre
There are many others but you will see them mentioned in the myriad threads the research will turn up.
Bon Chance
LF