Ruger Sp101 .357
If your only gonna have 1 revolver, it should always be a 357, for the simple fact that, as you stated, it will fire 357, 38 special and 38 +P.
Finding ammo can be a tough task these days, and a .357 puts you at a serious advantage.
There are other revolvers you can buy that can shoot multiple types of ammo, such as the Judge which can handle .45 Long colt / 410 shot shells. But I would'nt recommend them.
Last edited by SonOtheSouth; January 20, 2013 at 08:03 PM.