I vote for the 3D because it is probably in stock at your local music store. Buy it and use it for this season then look over the other suggestions the rest of the year. I use a 3D if that means anything. I had a custom 5D made and it is tighter blowing than the 3D. Find a good machinist to drill it out one drill size and you'll be in pretty good shape for marching band and jazz band. The mouthpiece taper will fit into a #1 morse taper in the tail stock and chuck the drill bit. You should probably use a reamer before you try a drill bit. Have a good year.