Having a mouthpiece plated in silver is the best comprise between durability and affordability. The Bach Cornet Mouthpiece line allows a performer to find just the right combination of mouthpiece characteristics to achieve their own sound concepts.
The Denis Wick Tone Boosters are designed to fit most mouthpieces to increase the mass or weight at the cup of the mouthpiece. This allows the player to get a bit more energy into the horn without additional effort. They also help stabilize the mouthpiece to make it easier to "lock in" to the notes.