I appreciate the vintage approach, but bearing in mind your liking the SP100's, the one other modern avenue I would want to follow myself (given the money and space) would be the Harbeth 40.1. I loved the big ATC's when I had them, but as Ashley keeps reminding me how times have moved on, the Harbeths do seem to combine modern technology where it matters, whilst developing the incredibly well researched BBC ideals - the info papers published on the Spendor Yahoo Group site are very easy to read and very comprehensive as to what things did and WHY - no BS there...