Quick, when I say “cable service in the District,” what springs to mind? Odds are, you’re thinking Comcast’s overall ineptitude and Verizon’s never-ending quest to get FiOS into D.C.’s living rooms. But while there’s little doubt that said topics represent the lion’s share of the headlines, Washingtonians may tend to forget that region’s less monopolistic cable operators have just as many foibles. According to postings on the Cleveland Park listserv, there are a group…