Thanks, everyone, for all the recommendations and useful information. I decided to go ahead and order this Weaver Classic Handgun Scope in silver. I spent some time this evening looking at a few red dot sights that a friend owned, and I felt I needed a little magnification of the target, so I opted for this scope in the 2.5-8 x28. I'll know in a couple of weeks if I made a good choice or not.

Weaver - Classic Handgun Scopes - Optics for revolvers & pistols