Welcome Jaxwired
I was running my Dynaudio 1.3MKIIs for a few years with a 3BST and found they opened up a lot with the 4BSST, even at lower volumes.
Depending at what level you listen to, you'll appreciate the extra reserve when it comes to dynamic music.
Currently I'm running the Dynaudio Special 25's which are an easier load, but would not return to a lower powered amp.
Think of it this way, two people lifting a 10lb dumbbell, one's a weight lifter the other your average joe, both have no problem lifting the weight, but who's going to lift it longer and easier without strain.
Robert