I have the opportunity to pick up either a Smith and Wesson 45 or a 10mm each with a 4" barrel. I like both and they have their pro's and con's. The biggest con for the 10mm is that Smith and Wesson isn't making them anymore. The 1066 that I am looking at has 3 magazines so I won't really have to worry about getting anymore. The pro's for the 4566 is that it's still in production, magazines and parts are readily avilabile but it ain't no 10mm.. give me some advice.....plzzzzzz.