Simon..I think much of the advice given thus far is good and wise!!!
Try living here for 2/3 years whilst the kids are young.. Find out how much you really want to live here before selling your house and investing your nest egg.. I think your business plan has merit though..Especially in Angeles..Lots of potential there for a very nice % return...
No rush.
Anything more specific...Send me a PM..
Cheers,
Fred.