Hey Chocks,
I'm at NAC at the moment, and when I arranged to pay a visit to the FSDO back in November, I used the Miami FSDO. I actually arranged to fly there with an instructor, which then allowed me to do my check flight on the return!
If you decide to do this you have two options:
1. Land at the airport to the North where there are no landing fees, but a more expensive cab ride to the FAA building, or:
2. Land at Miami Intl (what an experience that was!) and pay the $35 landing/handling fee, then get a short cab ride to the FAA. 5* - would recommed you do it this way. The flight is approx 1.5 hrs each way.
All in all, I am told that both cost roughly the same, I chose to fly into Miami Intl as I thought it would look good in my logbook!
All the best anyway, may see you around here soon.
Cheers
Andy