I have been to OFT plus one other which was not on your list. I came back from OFT just before Christmas, and would highly recommend it (see the "Hour building in Florida" thread) - despite what one or two other people said.
You should state on the board here exactly what it is you intend to do - sounds like full 0 to ATPL course. Not many US schools do the JAA IR, so you will probably have to get FAA and convert, or at least be very careful. I would also check how many JAA IR students any school had had, and ask for references to make you do not become an experiment (most US schools have only just got re-accredited for advanced JAA courses). Also remember that you will be instructed by FAA (not JAA) instructors. I encountered some lack of JAA course awareness when doing my CPL.
There also seems to be a certain amount of snobbery by the airlines about where you do your IR - if it aint Oxford/Cabair/one or two others in the UK, you may find your CV lower in the pile. So said the airlines at the Flyer shows in 2003.
For choice, I would go to OFT for 0 to CPL, and pay the extra to complete the IR in the UK.
Lastly, the Florida Duchess rate was $169/hr (less $10/hr in a hour-build package) at OFT and EFT/Ari-Ben in December, but I suspect rates have gone up in the new year.
PM me if you want to know more...