Of the pistols you listed, I have the Sig Mosquito, Sig 1911, Walther P22, and although not the Ruger MKIII but the 22/45. They all are fine pistols and fun to shoot, although some are a little more pickier than others about ammo.
I personally like 1911 pistols, especially if they have a little horse on them, and the Sig 1911 is a good quality pistol that does provide one with increased user familiarity at a cheaper cost.
You really won't go wrong buying any of those you've listed, but if you carry your EMP or it's for home defense, it would be cheaper practicing your skills with the Sig 1911. But don't exclude training with your EMP altogether. :-)
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