What does your present MP NOT do?
What change in sound would you like?
In my case, I want a big sound but a Bach 1 was more than I could handle.
I wanted a little brighter so I have been playing a Bach 3D which is a slighly shallower cup and it has been fine for years
All my horn mouthpieces are 3s no matter the dup depth.
Having said this I am about to try a Wedge sinceit semed to give me a fuller sound