Turner and Thornton for me.
Both have a lot more experience and success taking end of the game shots than anyone else on our team.
The exception could be Rondo who gets stuck with the ball in his hands at the end of quarters and games, the D sags off him, not respecting his shot, and most of the time he doesn't score. Not sure if the stats back this up or its just an unfounded perception. Sure feels that way though.