The mirka ones are good as are their sanding discs & strips. Other tool i bought a few years ago was one of these, http://www.globalfinish.com/rupes-sl42ae-long-bed-sander-240v.html , with a 28ft boat hull to fair & paint doing it all by hand was not an option. Bit of a beast to use but does a fine job.
I have desouter & CP air files as well but had no compressor at the unit & no way of getting one in there on time!