And if you do go for some 63s Bev there's an often overlooked sub-woofer option available for them (probably not made any more?) I got lucky on a used set from eBay during my experimental phase, which sadly I no longer have.

Astonishing bass response and they raised the Quads up to 'sitting-on-sofa-ear-height'.

http://www.regonaudio.com/Gradient%2...Subwoofer.html

Steve