I suggest that a PPL in the USA will be substantially cheaper than the UK. Having knowlege of both OBA and OFT, I know where I would prefer to go! All inclusive prices at some places are not the same as all inclusive prices at others! You need to be sure that "all inclusive" is exactly that! The surprise "extras" at the end can take the shine off of the experience! Personally, I would choose OBA since it is apparent that they have cleaned up their act during recent times
It is a shame that NAC are not doing JAA training since they were in my opinion the best of the three.