I played a Schilke C through college (courtesy of the school...) and loved the horn. Had alot of "bite" when needed.
I play a Yamaha now. The heavy wall one. I can work with it to be big and full if that's what I need or lighter and more chamber like if that's what I need. (I'd like some mods done, but not before I can justify the cost). I've tried several Bach C trumpets. If you can find a good one, and I did play a good one, they are absolutely astounding to play. You have to take your time and find a good one. Do this with a good teacher or trusted freind who knows your sound preferences. I tried a Kanstul, too, and liked it alot.
If you can sink the cash into a new horn, (just don't leave your case open during quintet rehearsals... or set the soft case on the floor of the recital hall during your freind's recital...
) I would. You'll have the horn a long, long time if you get one you love. (My Bb went 20 years and my son uses it now).