Speakers for Leben CS 300XS

I have a Leben CS 300XS and am running Zu Soul Superflys (which I love). I'm in the process of cleaning up a lot of old gear and am thinking about picking up a second set of speakers that might make a nice foil to the Zu's. I've been looking at:

-Triangle Cometes or Altea
-Proacs (would love recommendations)
-Klipsch
-Dynaudios (would love recommendations here, too)
-Devore Fidelity Gibbon 3XLs

Any other thoughts with this amp or a similar el84 amp (it puts out 15w or so)? My listening room is 9 x 20.