The only cat I want is of the stone cold murderer variety. Mice get in my house from the creekbank. They have to be assassins.
Yeah, every time there is a stinky pile of guts outside the door, at first I think this is gross, and then I remember that is one less mouse that could get in my house. A good outdoor cat is great. You only need one though, don't get crazy.
We had mice when I first bought my house. Not a single one since the cat snuck in the engine compartment of my car and hitched a ride to my house.