From what I've seen a Commando will usually bring a premium over an Official Police, although the likelihood of the refinish diminishes that quite a bit as mentioned. Out here I'd expect to see one similar listed anywhere from 300-500, depending on the urgency and optimism of the seller.

The Viper as some have mentioned is a different story. You will need factory confirmation of its originality, but if that can be provided with a bit of patience even in this currently somewhat down market I'd be surprised if you didn't eventually find a player in the 1500-2k range, or even a bit higher if the factory docs reveal something quirky or interesting like a very early/very late date.