When I was doing my field work, I carried the Taurus Judge loaded with the .45 LC. It was a bit bulky but at the time it was the only pistol I had. Right know I own a Springfield 1911 A-1, Springfield XDM 9mm and the Judge. Thinkning about getting a Compact Kimber probably in a .40 so I can get my CC.
I'm a huge Glock fan, and love the .40 S&W cartridge. Can't go wrong. That is, if you just have to have a semi-auto. I prefer revolvers.
The Springfield XD is a great gun, also, but no conversions available that I know of. Probably will be one day soon.
Really, I think you'll enjoy it as is, and won't need the conversion, unless you plan on doing lots of target shooting and want to same money on ammo. I use mine for small game and javelina, etc. with good success and lots of fun.
The one I carry most, though, is a 3" barrel .357 mag Ruger GP100. Love revolvers.
“We do not go to the green woods and crystal waters to rough it, we go to smooth it. We get it rough enough at home; in towns and cities;…” -George W. “Nessmuk” Sears-