Reference 3A Grand Veenas vs Avalon Eidolon

Think long and hard. You have some mighty fine speakers already.

Shakey

Grand Veenas are one of the great buys in audio. Much easier to set up than Avalons.

Apples/oranges really, but my impression is that both would play more or less in the same league and each have their fans.

The Reference 3A works very well with a wide range of amps. The Avalon not. When you go for them, the amps will give you some thinking. High powered amps AND good sound are not cheap. And the set up is much more demanding compared to the Ref 3A.

"Think long and hard" +1
There's hifi considerations and then there's musicality considerations (as Rcprince noted). Syntax makes a very valid point. It's an advantage to have a speaker that can be driven by high quality low-moderate power amplifiers. These types of amps can often provide superb sond quality.