What is a good bass trombone model?

Question:

What is a good bass trombone model?

I'm looking for one with two indepent triggers, open wrap, and possibly interchangable bells and lead pipes? I want a deep, dark sound for symphonic band and a bright sound for stage band. I tried an older getzen model (5 years-old?) at one point, and the sound was a lot darker than I wanted. It could be just the old models though. I don't want to lose too much in the high range, but I want the low notes to really pop.

Best Answer - Chosen by Asker: Or buy an Edwards. They make everything custom and everything on their horns is pretty much interchangeable.