For where you live a .357 is enough for bears. It's not as if you are going to run into a Kodiak or Griz in little Havana.
The 454 was developed for BIG bears, (that were handled pretty well with 44 mags before that )
If you feel the urge for a big bore blaster I'd go with the .45 Colt the guns and ammo are less expensive, you can still get the 454 lever gun and shoot .45's in that.
Ask Haz about the Ruger's, he has the Redhawk, but a Vaquero and a Puma would make a nice pair.
Might even break your addiction to plastic
