I ride my mtb to work and usually wear rain pants, rain jacket, booties, and gloves during the winter. Shorts and sunglasses in the summer. I've been meaning to get a rain hat cover for the helmet too. If you hit the trails (well certain trails) be prepared to get covered head to toe in some serious mud. I guess maybe I should get some fenders too.

If you don't like booties (I don't on trail rides) check into seal skinz socks- feet stay warm and dry. Do check out the bbtc and cascade. The cascade club is more roadie oriented I believe.
Do you know yet where in seattle you will be moving too?