Johan, thanks for the great link!
and everyone else, thanks for all the insight. So i'm leaning towards non-DIY because size is a pretty big issue for me... and it seems like 4 growlers are a pretty solid choice, particularly because it should be easy for me to arrange a listening test. So now I'm just wondering how 4 growlers would compare to 2 Danleys (TH212 or TH115)? Some pretty thorough searching hasn't yielded much of anything on the TH-212, other than some general comments by Ivan and Mike. I know I can trust the Danley published specs, and they seem to indicate that the TH212 is amazing - but has anyone actually used/heard them -- and how much do they cost...?