Professional Performers:
Sergei Nakariakov
Allison Balsom
Wynton Marsalis
basic-intermediate horns: getzen, yamaha, bach, jupiter (nowadays, in the past no, so make sure they are modern)
advanced- I would heavily recomend a Bach Stradivarius, but the Yamaha Xeno is ok, and some of Jupiter's top line horns are pretty solid too.
more mouthpieces, I would say start on a Bach 7C mouthpiece, 3C for advanced students, but basically whatever they can sound good on.
www.bachbrass.com - great horns (at least trumpets) for all level students, plus solid mouthpieces
www.jupitermusic.com - decent horns (at least trumpets) for advanced students... I don't know if I would
recommend the lower level stuff, just because there are better options out there. Namely Bach and Yamaha horns.
http://usa.yamaha.com/products/musical-instruments/ don't know about other instruments, but yamaha trumpets are solid choices at any level- the Xeno is ALMOST as good as the top level Bach horns.
www.wwbw.com woodwind and brasswind is a pretty solid site too- they usually have decent deals, and they have quite a wide variety of horns and accessories. They pretty much have any of the basic horns too- trumpet, trombone, clarinet, etc.
Principal Trumpet - Phil Smith, principal trumpet of the NY Philharmonic Orchestra. Useful for trumpet recordings.