I was going to complain about both the 9th and the 10th Doctor having a finale as their choice, but it's actually hard to pick a two-parter for Tennant. Maybe Family of Blood would be better, but that's awkward since the Doctor isn't the Doctor for most of it. Eccleston could have had The Empty Child instead, I suppose, but I do think the finale sums up his reign better. The Impossible Astronaut is a very good choice for Matt Smith, though (better episode than The Time of Angels, although both have the necessary companions). If The Angels Take Manhattan were a two-parter, I could have seen that one chosen instead. But it's the best choice for a single-parter.