Wot no Pringle?
But seriously... Botham for me too, although he's a hard player to assess - in the first half of his career he was operating at all-time great level, but then came The Beergut Years, in which he was twice the size but half the player. Still annoys me that he let his fitness go like that and no-one called him out on it. Stokes was top-class for longer, and I'd put him second. Flintoff had one incredible series (admittedly quite an important one) but was otherwise a good player, not a great one. I'm not old enough to have seen D'Oliveira, and just missed seeing Greig play. Obviously none of the others are serious candidates.