I am afraid that I am biased to Herbal Healing (15th and 80th in Ballard); the owners are extremely caring, help me constantly with my growing by offering practical advice, great medicine with reasonable donations accepted. I have been to several, and as they were all kind enough to accept my membership and offer medicine in very hospitable and safe environments, I will not degrade any of them; I will highlight one in Wallingford (forget the name, but it's in the Tallman building) - outstanding medicine, knowledgeable staff, very reasonable donations accepted.
Sorry to blabber on, but one last comment: I personally hunt for Sativa dominant bud, while a friend of mine seeks Indica; we do not agree on the best co-op because each has something unique to offer. This is ultimately why I think touring them is great fun. I'm an avid wino as well, and my girl and I love to go wine tasting - it's very similar in my humble opinion.