Bloodthirster or lesser daemons

For a 1k point army, which do you think would be generally more useful:  A bloodthirster, or the equivalent number of bloodcrushers and a chariot?  The army would already have a daemon prince with wings as the hq, and already has one unit of three bloodcrushers, so the additional models would make the squad into a bigger block.  This is geared towards what will be more useful in random games against random opponents, and would be a part of a two person team.