Avalon, Vandersteen... which to move to?

Hello-

I am considering a speaker upgrade, and am considering either Vandersteens (2CE w/2Wq sub, or alternately the 3Asig) or Avalon Ascendants... or I could keep my ProAc R2.5s. I won't be able to audition these together for a long time (and auditions at different dealers w/different equipment are hard to compare), so I'd appreciate any comments you may have, particularly:

- Are these Vandersteens competitive sound-wise w/the Avalons?
- Would the 2CEs be enough better than the ProAcs to make the shift worth it?
- 3Asig vs 2CE w/sub?
- Other advice (about these brands)?

Many thanks!

PS: I currently have a Chord DAC64 - Rowland Synergy IIi - Rowland Model 10 - ProAc R2.5, and the speakers would be the final change in the system for years. Listen at moderate/loud-ish levels in rooms of various sizes (move a fair amount) and to Grateful Dead/Bela Fleck type stuff.