Based on this criteria, I would suggest Coronado Springs. But only if it will be several months before you go, as its under heavy construction right now. DH and I have stayed at all the moderates, and while I don't think you can go wrong with any of them, Coronado fits this description the best IMO.
Coronado caters to business travelers and convention attendees, so by nature of this, the resort seems to feel more adult-oriented. There are three bars on-site, and a few extra dining options than the other moderate resorts. It also has a gym and spa, which is just a little extra that the others don't have. The decor is very well-themed, and really transports you but doesn't scream Disney at all.