speaker upgrade fever

I’ll second the Joseph Audio Pulsar’s. The fit, finish, design, quality construction/materials and overall sound quality for a bookshelf speaker is outstanding. You can’t go wrong with JA. These are far superior to the DeVore O/baby. Of course, the baby’s are less expensive. Both speakers need stands. Have fun and take your time. 

Since you mentioned the Vandersteen Treo, which is a great speaker, may I recommend considering a good pair of used Vandersteen Quatro CT's. The Music Room had (perhaps still has) a pair for about $8.2k. 

I have the Quatro's and find them to be very good and work well with th kind of music you stated that you prefer. I share those same preferences. 

if that's not possible or preferable, then the Treo CT's would be just great.  

Best of luck to you!

I've seen a few reviews on the DeVille. Is the SQ worth the extra money?

The Borresen X-3’s are a laid back but highly detailed sound and look Beautiful in white. You’ll have a love affair with them. There’s a reason people are talking about them....9K

Nice to see you mention Triangle which I believe are too often overlooked. If you are considering (especially) the 40th Anniversary Duettos I can't imagine you'd not be terribly pleased. I find them balanced, neutral, open, and so holographic that at times they can be nearly frightening. Fabulous speakers!