"End of the World"
"Father's Day"
"The Empty Child"
"The Doctor Dances"
"Bad Wolf"
"Parting of the Ways"

Those are my favorite episodes for season one. Not to say I didn't like the rest, of course. However, if I have to pick my favs, those are it. "The Long Game" was, to me, the weakest of the entire season. Davies wrote it over ten years ago with Paul McGann's Doc in mind, and, you can tell. It's a bit dated...