Thanks for the answers!
The more important info I was looking for, was the thing with the aircraft registration and US airspace, but the other info will be useful as well..

I Live in Israel, and flight here is mainly CVFR, anyway insted of travaling all the way to the states, i was wondering if i could maintain the currency over here - and no problem finding here FAA CFI+II's. <-answered that! -> Thanks again.
p.s. - sorry for the ignorance but what is IPC?