I'm also looking, and we have decided on Eugene, Oregon. Mild climate, trace of snow in winter, but lots of rain, 46-49"/year, mostly from Oct to March. State has a 5% income tax, but no sales tax, and property tax rates are similar to CA's.The entire S-W is in the midst of a prolonged drought, and all the pine trees are dying. Florence, Oregon, out on the coast, is also nice, but not much culturally except movies.
It was just rated in one survey as the #1 retirement spot.
Eugene is one hour inland, and we plan to get away for a month or so every winter.