I've flown with
Wings Aloft at Boeing Field (KBFI). By US standards they are very expensive, but have the advantage of a well maintained fleet of capable aircraft.
I've flown their P210, and more recently took a VFR jaunt in one of their Seneca IIs (+ instructor) up to Paine Field then around Mount Baker and Whidbey Island back down Puget Sound to Seattle. It was the most extraordinary flying I've ever done. Whoever you choose to fly with, do it. It's fantastic.