I Play on a Courtois 'Elite' C/Bb Trumpet (Which I don't think is available any more). I use it for Jazz, Orchestra and anything else I'm asked to do really. I find that it plays well in all registers. It isn't as heavy as the 'Evolution' instruments either. I've been playing on it now since Summer 1999 and I'm glad I bought it. I also have a Courtois Chambord II Cornet.
You can see the details of the trumpets at the Fred Rhodes website (Which is where I bought mine)
http://www.fredrhodes.com/ins_cat/trumpet.htm