Personally I feel that if you end up doing your CPL/ME/IR somewhere other than where you completed your PPL and hour building, that's not too much of a problem...but I do here differing views on this.
From what I have read operators don't really care where you got your PPL from, only that you had your CPL/ME/MEIR from the same school ... and until a few months ago I thought this went for most airlines but apparently this rule is only aplies to one or two airlines. There are plenty of pilots on here that have gained a JAA CPL in Florida and a MEIR in Spain and have managed to get jobs, so how much truth is in the whole "train at one school" is down to you to decide.
Hour building in the same area as your choosen CPL/IR school might be an idea though (in order to get used to the landmarks and airspace).
Good luck.