Center Cycles in Renton has Specialized, Giant and Kona to name a few
www.centercycle.com
customer service that can be described as interesting......
they gave me a great deal on my bike, they searched literally to the ends of the earth to get it for me (its one of only 9 made in my size!! and had to come from another shop in Australia), but they did keep looking at my husband when I was there the first time looking, they really did not seem to be taking me too seriously (until I came in 3rd in their sponsored race) and they tried to talk me into a bike that was a size bigger...

Bicycles West - www.bicycleswest.com has some big brands too, Specialized and Trek that I remember. They are quite close to Center Cycle so it would be easy to visit both (and Ikea too - which is right inbetween the two)

both have a pretty good inventory so it would be likely that you could ride some bikes in your size.