You better go with the Tan for the transition because they are offering transition customers 1 yr of basic programming free and from second year they are charging basic plus korean packages. If you go straight with dtv you are not qualified for that package.
Please make sure do not connect the cable leads to cable modem into diplexer.Most diplexer in the market does not pass low band such as 5-45Mhz for cable modem to work.