What they said. Plenty of DA revolvers out there that'll work, unless you're in love with the idea of a "real" SA (like the Ruger Vaquero,which is sweet) or really want one o' them cowboy calibers (i.e. .45 Colt).
My question is revolver or semi auto? My answer for both would be the same Ruger. New Vaquero for the revolver and Mark III these day's for the semi auto.