I'm being totally honest here, I would hold off getting a new horn until 3/4 of your way though your senior year. Why subject a new pro horn to high school band, going between home and school a lot, and to pep marching band. either hold of getting one, or else use your current horn most of the time. as for the kind of horns, try them all. Not that i'm a expert on these things, but most major brands have good things going for them and are worth checking out. DON'T just go into this thinking "I'm getting a selmer" or "I like that one" but try them all and then make the choice. good luck!

Get a solid pro-line horn by your senior year. This will give you some time to learn its intricacies before solo and ensemble competitions (where college profs may be hanging around) and auditions for the studios. I ended up getting a Yamaha custom (thanks mom and dad) at the begining of my senior year. Keep your 23 fro marching band, pep band, etc. Check the college your planning on auditioning at as well - particularly their marching band (if you major in music, you may find yourself there). See if they provide the band with instruments (mine did) or if you have to provide your own. If you got to provide it, keep your 23 in college. Think Selmer SA II or III or Yamaha Customs for your pro-series.