Port City is a great group of guys. They have a facebook page, couple of their members are on here I believe. If you want a more serious magfed/tactical group, look up Callsign Boxer. Another good group of guys who, from my dealings at least, a bit more into the tactical style of play.
As a side note, there's a 1 day scenario on 5/18 at ABP. There's usually at least a couple guys from Port City at those games.