Ok, my vote was for the 1911. Modified to your specs of course.
I love my pistols, especially the RIA that I built for rough use using several MEU specs. It's underwater or covered with dirt or mud most of the time when I'm out camping - though it does get cleaned thoroughly when I get back to camp.
But, I have to go with everyone who suggested a long gun. I live in the country, and if I don't know what I'm facing, I grab the Mossy 500 (7+1 capacity, folding wire stock, heat shroud). If I know it's a coyote or that I'll need range, I grab the SKS with peep sights (which I prefer over the AR15 or AK47, say what you will).
However, if it had to be a pistol, and I had my 'druthers:
1) 1911. Flat MS housing, fitted beavertail/commander hammer setup, rail with white light, night sights, ambi safety (King's or Kimber - I'm a lefty), Pachmayr wraparound grips, maybe night sights, and Wilson 10 round mags.
2) Beretta or Taurus 92. New 6" Magnaported barrel should be installed. Maybe night sights. Hogue grips (very tacky and grip well.) Mec-Gar 20 round mag. Corbon 90gr +P "Casino Load" @ 1500fps (flash suppressed, decent terminal performance, albeit a bit shallow, low overpenetration.)
Josh <><