Dev,
I am not alone in my findings about MBLs... In fact very good friend of mine is Classical Music Piano Player(you probably heard about him but, I will keep his name for myself) and he told me that Bosendorfer on his own recording do not sound right on full MBL system(101, 9008, 6010D etc.). And this is his presonal system... He is now searching for something else after living with MBLs for over two years. Those two lenghty sessions were at his home and I agree fully with him. Interesting enough Rock music like Guns'n'roses sounded just right on this system...
Rockport Altair cost $89500(or $91500 in Titanium color) in US. Overpriced? Not IMHO. Just read Jeff Fritz review about them
http://www.ultraaudio.com/twbas/twbas_20071001.htm It is very honest and accurate description of their sound IMO.
Back to Isis... You find Eidolon Diamond superior to Isis. Well, I disagree big time here. IMHO Isis is a much, much better speaker then Eidolon Diamond. Freedom of speach I guess... Long live the difference in our ears and opinions!