The best is the Parker Hale Enfield sold by Navy Arms, and a few other outlets. These come in the short Artillery Musketoon, the 2 band Sgt's model, and the standard 3 band.
These are made to the original British Tower "sealed pattern" model, so it's absolutely
exact.
I had the Musketoon, and I used the recommended Lyman 565gr bullet mould. It shot VERY well, both because of the heavy bullet, and the original type progressive rifling.
As an accessory I also shelled out the money and bought the Parker Hale Sgt's tool. This is a tool to remove the nipple, disassemble the lock, remove stuck bullets, etc. Very handy.
I really wish I'd kept it, because it was the most fun blackpowder gun I ever had.