The Triump is the best for convience ans sabots [they shoot PB's and Saborthooth bullets very well but for a lead backed conical mine has to have a thick greased wad and a20 gr vol. of corn meal.
The White is the best conical shooter but it might be hard to come by 4 of them.
The Knight KRB7 is a good gun if you perfer a heavier one it will shoot a wide ranger of loads well.
If price enters into the equation the the best gun for the money is the Z5 Omega.
If you want something low priced then your are looking at a CVA or Triditions.