I listened to these extensively, and also the Evoke 10 and the small floorstanders, the Evoke 30. With both solid state and tube. They all sound quite wonderful, and the bass on the 20's is noticeably fuller and more rich than the 10s, but the 10s are quite punchy and clean. I take it open box is about $2k or so. For that money, I think I'd prefer Salks or Fritz.
https://www.salksound.com/type.php?format=Bookshelf
https://www.salksound.com/type.php?format=Monitor
http://www.fritzspeakers.com/DreamWeaverFritzCarbon7Mk2SpecPage.asp
https://www.salksound.com/type.php?format=Bookshelf
https://www.salksound.com/type.php?format=Monitor
http://www.fritzspeakers.com/DreamWeaverFritzCarbon7Mk2SpecPage.asp