Speaker Recommendation for Nuforce Cary Blend

I am thinking of upgrading my speakers, as they have fallen behind everything in my system and sound a little muddled with very fast music (Kings of Leon, some Pink Floyd). They sound great with slower paced music but just sound confused sometimes.

Current setup

Cary 306 SACD Pro - Sweet upgrade from 303/300
Cary SLP03 Preamp - Verdict is still out, might need to retube.
Nuforce 9v2se - about to upgrade to v3se but highly recommended.
+ Sonus, Nordost Speaker wire, Mac Cables XLR

Speakers Dali Mentor 5

Any thoughts, I tried MS5 Euphonia but they were just to big for my room. Thinking maybe of trying out Wilson Sophia 2's, something that it isn't to large ($6~$11k). In the early 90's I liked the Tannoy / Arcam blend, english sound but haven't been impressed with Tannoy as much these days.