Of the pistols listed, I have owned three Sigmas and three Taurus pistols. I have examined the FEG a couple of times.
I think that the FEG and the Taurus are the closest to a "clone" of their original respective pistols as you can reasonably expect to get. There are a lot of people who really dig the FEG, but the Taurus is the one that I have the experiene with, so that is what I voted for. I think the new Tauruses (Tauri?
) are even a little better than Beretta
and they have a pretty good warranty.
I don't consider the Sigma a clone. Even though polymer-frames (from any manufacturer) aren't my thing, it's actually a very good pistol. You just have to get over the fact that it's a S&W.
The others I don't have enough experience with to make much of a judgement on.