I'd go with the Kimber Rimfire. If you have a 1911 now, why would you not go the conversion route? I don't recall the cost on mine, but it seems like it was less than $300 with the identical Target Sights as the Kimber Target Model 1911 it usually resides on.
The benefit is a little more than two-for-one. You are literally shooting the same gun as far as the grip, trigger, etc.
The Chiappi thingies are about the same price as a very-well built Kimber Conversion. (Actually, they are built by Ciener) Top-notch stuff.
If you don't have a 1911, I can understand the desire for avoiding a kit. In that case, I'd go with a Ruger Mk II or Mk III and get the 1911-style one. They really aren't the same, as someone pointed out, but they are great guns.