My favorite's that I have actually pulled the trigger on are 22 Hornet, 30-30, 243, and 410.
The 4 that will make my collection are:
7mm-08
20 ga slug gun
218 Bee (if I can get one) or 357 max
20 ga with a screw in turkey choke.
These may not be everyone's cup of tea, but they sure would make the Brownings and Berettas stay in the gun cabinet from now on!!!!!