Might want to look at Windsor (Sonoma County). Holiday Inn Express, Holiday Inn, Hampton Inn all within walking distance from each other are in the $200 -$250 range. Expect anything Healdsburg (5 miles up 101) to be pricey, both food and lodging.
And, I think Windsor is the epicenter of best back road driving in the State. Sonoma County has it all; corner to corner from one vineyard valley to the next, out through redwoods to the coast, and (of course) there is the coast.
Ann and I were out in the spyder this morning for the first time in a long time. Just a quick 2hr shot through a few canyons and valleys to charge the battery, if nothing else. Along the way I commented that these roads are as fun as Tail of the Dragon in NC. She agreed.
Mid October is the best time.