Every Doctor Who regeneration ever

Okay, not every regeneration by a character on Doctor Who (cf Romana, River Song, Cho Je, Borusa, The Master, etc), but all the on-screen regenerations by the Doctor on the TV show Doctor Who (that should keep the pedants at bay, although someone’s bound to mention the Valeyard, that one in Journey’s End…). What’s your favourite? Still loving Caves of Androzani myself, but there’s a lot to be said for Tennant to Smith.