YourMileHighness,
I went to the U.S. with a SACAA PPL, and have got a FAA & CFIMEII.
Westhawk has it bang on, contact the school you plan to go to and get all the TSA requirements from them. If you do not have a night rating you will have to do the night and I.F. requirement before you can do a US PPL test, ie MEL. Both 3 hours.
Good Luck