First, the 544 is a pretty good amp, ahd one for a while, and it will be nice with B&W's, so don't fret.
The only difference between the CT and Delta series is the CT is designed to fit into an installed rack (think Middle Atlantic) Sonically they are the same.
The only difference between the CT and Delta series is the CT is designed to fit into an installed rack (think Middle Atlantic) Sonically they are the same.