I would say get a Springfield Mil-Spec and build it up, personally I don't like any of the $700 range 1911's they all have front cocking serrations. I would stay away from Taurus, I had one it was a POS. If you really want a Sig, I would look for a German model, the one I had was great, the trigger broke crisp, and I never had a failure of any kind.
"No man for any considerable period can wear one face to himself and another to the multitude, without finally getting bewildered as to which may be the true." Nathaniel Hawthorne