This is what I can offer ... I have 40's and 100's V2 ... I listened to the 60's and 80's (Which I believe they stopped making the Studio 80's) by Paradigm and they are not as well balanced IMO compared to 40's and 100's .
The 60's in particular I remember sounding a little fat in the middle and the bass was a bit bloated (They are fine speakers , so I mean this in a minimal way)
I picked up Axiom M22Ti's then the M3Ti's and I truly like the sound of these. They compare very favorably to the Studio 40's (The 40's have more bottom end than these though) The quality sound they produce is simply excellent IMO.
Having said that I have not heard M60's or M80's yet , but if they produce the same level of quality sound they should be at least as good as the Paradigms for a lot less money.
