Choosing the right Bryston amp


Hi all,
Interested in input on which Bryston amplifier would be most appropriate to power a pair of Revel F30 Performa loudspeakers. Is the 3BST enough? Or do I need at least the 4BST to get my money's worth out of the speakers?
Thanks.
skippack
IMHO go for more power than you think you will ever need - the bigger amp. On some tracks you will be glad of the extra head room.
So it's not like the 3BST isn't powerful enough, just that the 4B will sound better? Will it sound 1500 bucks better, do you think? (I know that's a subjective call; I just want to make sure, if I go with the 3B, that it's not struggling to power the speakers. I know that can be a concern with more expensive speakers.)
The 3BST should suffice for all but headbangers who probably aren`t Performa 30 users.