To Vandersteen or not to Vandersteen

You all have been quite helpful. Thanks for the feedback. And as a former Maggie 3.6R owner, I'm always seduced by the big planars; maybe one day I'll go back to them.

I think it would be a bit of a sideways step with the Decapo being a bit more neutral and the Vandy having a bit more low bass

Why not look into a good sub or pair of subs?

I had the 2 Sigs and now have Thiel 2.4s which are much more dynamic and present with a much more stable image. Good for you for choosing time and phase coherent designs!

find them cheap preferably Sig 3A's so you can play them and sell them if you don't like them. they like power and they like medium to large listening room. the best sweet spot distance is around 10' and same applies to apart.
to me the definition and resolution is perfect while bass is somewhat slow. they're best for large symphony orchestras. great with 60wpc+ tube amp or 100wpc+ solid state amp. In my past experience at Audioconnection of Verona NJ John Rutan was demoing them with Quicksilver M60, Rogue Magnum 88, Bryston 3b-st or Ayre(can't recall model). Please tell which amp you're going to use