Being in Northern California, we have a great local manufacturer. I purchased windows from Sierra Pacific Industries and got fully customized aluminum clad wood windows at a cost that is normally only available to builders. You may find that these windows are cost competitive with Milgard, but the quality is up there with Andersen and Pella. Take a look at their website, http://www.sierrapacificwindows.com/html/aluminum_line/default.htm
In my case a company representative took all the measurements and the custom order was ready in 6-weeks. You won't regret getting custom high quality clad wood windows. I was really happy with my purchase and service received.