Well, I've made a deal with a buddy, so that I can use his old trumpet for learning on, however, I'll need a new mouthpiece, as his is a small jazz mouthpiece, and I'm guessing it'd be hard to play on for me, seeing as I will be a beginner.

I'm planning to buy one of these mouthpieces:

Bach Trumpet Mouthpiece (Group I)

Bach Trumpet Mouthpiece (Group II)

Bach Trumpet Mouthpiece in Silver

Which mouthpiece/size would be the best bet? I am a beginner, but have played guitar for almost a year, and jazz saxophone for many years. I'd be mostly interested in playing jazz, and don't want to upgrade the mouthpiece for a while.

Thanks in advance, Pit.