Since nobody has mentioned it yet, the reason most people are recommending Jet Aviation to clear customs is this: at the new facility, you will need to start the engine(s) and reposition the aircraft to the FBO as there is no fuelling, towing or groundside access for passengers and crew. So Jet is ideal if you want all your requirements in one stop (plus they don't charge a daily/nightly parking fee; just a facility fee that can be waived with a minimum fuel purchase).