Henry,
My recommendation? He needs to find a local experience apart from the RPGA, because con gaming will lack the continuity and in-depth role-play that a home group can have. I stress that you can find in con games plenty of cameraderie, fun times, and good memories, but the games themselves will always be more disjointed that personal experience.
I would also suggest he try out ENWorld, and check into a local ENWorld Gameday, if one is nearby to him. Chatting with the people from these forums is a blast, for all the reasons you mention; gaming with them is even moreso. I don't want to come off as elitist, by far, because Gencon is by far my favorite convention ever; but you were speaking of a "vetting" process, and the people who make it so fun to be here on a regular basis are what make it fun to game with them in person, too. In a sense, they're "vetted" from regular convention-going crowds just by virtue of liking this place enough to stick around, even with the tone of moderation we try to establish here.
(re-reading that, it still comes off as a bit snobbish, but I can't think of another way to put it: Having a community of people who get along well in one environment are more likely to get along in other environments, is a better way. And not just enworld: If there are a number of people local to you who frequent a favored to you online community, it's a good experiment to try.)[/QUOTE]
I agree with your asessment of the community here. Dave is in Southeast Michigan. Is there an EN World game day in that area?