I think the Harbeth's you heard were my SHL5+'s in eucalyptus that JohnnyR sold for me so I could buy the Treo CT's. As far as I know they are the only Harbeth's John has had on display in quite a while.
When you heard the Treo's did he have the Aesthetix Mimas or the Belles integrated amp powering them? I can tell you that the Mimas sounds dramatically better than the Belles though, at their price points, the Belles amps are hard to beat.
From what I can find the pricing on the Harbeth M40's is somewhere around $10K used though you might find some a bit cheaper. I might suggest that you look into the Vandersteen Quatro CT's as well. They can be found occasionally in the $10-$12K range like the M40's. IMHO they are the sweet spot in the Vandersteen line.
When you heard the Treo's did he have the Aesthetix Mimas or the Belles integrated amp powering them? I can tell you that the Mimas sounds dramatically better than the Belles though, at their price points, the Belles amps are hard to beat.
From what I can find the pricing on the Harbeth M40's is somewhere around $10K used though you might find some a bit cheaper. I might suggest that you look into the Vandersteen Quatro CT's as well. They can be found occasionally in the $10-$12K range like the M40's. IMHO they are the sweet spot in the Vandersteen line.