OK -- Am a little confused about dual tuners & the like. So, very simply: I need Direct TV for two televisions. On one television, I'd like to have the DirecTivo service (meaning ability to watch one, tape a second program, or tape two simultaneously); on the other, I just need to be able to watch one channel, but independent from the first set. So what do I need? I know I need the dish with the two tuners, but what else? Splitters? Diplexers? Adenoids? Gears? Sprockets? Help!