Recommendations Wanted

Tektons do sound good driven but tube gear but due to the low impedance, they are never as efficient in room as you would think, particularly with tube amps.  It is reflective of the standard used to calculate SPL ratings, nothing they are doing.  Just something to be aware of.  
 

I might look at something like the Scansonic MB3.5 B.   The ribbon tweeter behaves differently and creates a more immersive experience in a more traditional speaker design.  This is a ribbon tweeter thing rather than just scansonic.  AMTs can deliver a similar experience but tend to drift a hair brighter though this is not universally true.  

One thing that would help the respondents is to know what it is in your current speakers/system you define as deficient.  Without that, we're shooting in the dark with respect to recommendations.  (In general, though, 40wpc is pretty weak for most B&W's.)

+1 on the Tekton Moab recommendation

My amp is a hybrid, tube/solid state, PS Audio M1200

MC hit all the constraints and compromises, build time delay and they are big speakers

Worth the wait and unrivaled price performance IMHO 

There is nothing wrong about those beautiful 40 watts (more like 65) from your mc240. Just complimenting your system.