As a fellow Vandy owner, all I can say is to audition a pair of Treo’s. Quatro's would be the best move, since you have the built in subs.
I listened to the Ohm's at the NY audio show this fall. To be frank, they were a bit of a disappointment. I liked them when I heard them years ago, but this time they sounded muffled and lifeless. I think speaker design has moved forward, and Ohm has stayed the same. IMHO.
I haven't heard the Tekton's, but have listened to Zu's. I was thinking a full range driver without crossovers would be the cat's meow, but I ended up realizing Vandersteen made a better product. The Zu's were close, but just missed the mark in subtly.
Bob