Faa Ir
Mady,
if the reason behind doing a FAA IR as a stepping stone to the JAA IR then you may want to ask around and see whether it's really worth it. Yes with a ICAO IR the requirements are reduced when doing the JAA IR, however although in monetary terms it still may be just worth it I know of a few cases where it did not pay off. This was due to the difference between FAA and JAA which led to a bit more than the minimum hours needing to finish.
Having said that you may be doing it for another reason so forgive me if this is the case.
Good luck.