Audiojoy4: What is the next best step stack them in pairs?
Yes that is a popular thing to do.
As a huge fan of quads, I am happy you have found your nirvana with them. You may enjoy visitng this site: http://www.go.to/mtaudio, then click Quad ESL.
Sadly, many people, myself included, just don't have the space for them. So it would be good to hear, especially from someone like you who has been searching for 28 years, what comes closest among traditional boxes?