Check out Vintage Doubles in Eastern Washington, looks like you're out that way and can probably make an apointment. I have not purchased a gun from Kirby, but have heard nothing but positive things and had the chance to talk with him at a show 2 years ago. Don't buy older double guns sight unseen / don't trust choke markings; most have been opened up. 28 gauge might be hard to find, but take a look at AYA or a webley & scott 700 for the mid priced. A imported stoeger gamecock made by V Bernardelli would be another on the lower priced side, have one and love it.
Side by sides that are balanced right are a pleasure to shoot. Handle as many as you can, including the new Turkish cheapos, and you'll feel the difference pretty quickly and which one points right for you. Learn to love the double trigger.