I would try to avoid having a mobile installation of a clearbra, there are too many unknown variables, dust/dirt particles, etc. that could be trapped under what is essentially a big sticker.
The main concerns are going to be familiarity with the car, and the quality of film; I had mine done by a company 'aerotect', which is local to the SGV. Here is the thread where I posted pictures:
http://www.nsxprime.com/forums/showthread.php?t=99937&highlight=aerotect
They use venture shield clear bra, which is an excellent film that has minimal yellowing. The job was outstanding, the price was lower than many other quotes I received, and they did it inside of an enclosed environment, where there was no danger of particles becoming trapped under the film. Since doing my car, they have done several other nsx's for local members.