What kind of lens should I buy to catch High speed action at the race track, night time, portrits and at the beach.

Sigma ?
Olympus digital?
50 mm?
35mm?
the only lens I have is a 14-45 kit lens. help

HELLO hello hello hello

well what are you looking for. if you want something for the race track youd want some zoom no? or the strip u mean? you would have to be a little more specific. i think.