<ELAC dealer disclaimer>
The ELAC Uni-Fi series is a noticeable step up from B&W 600 series, despite it low price. The ELAC UF5 is a floor-standing, three way that I believe is worth adding to your list. They only cost $1000/pr, same as your 684's, but they easily compete with the CM series. I was amazed when I compared the UF5 to the CM7/CM8/CM9. I found it to be much better everywhere. (I sold B&W for 16 years, very familiar)
ELAC has another line, Adante, to be released in June that will have a $5000/pr 3-way, floor-stander. I imagine they'll give the 804D3 trouble for half of the price, but of course need to compare first.
The ELAC Uni-Fi series is a noticeable step up from B&W 600 series, despite it low price. The ELAC UF5 is a floor-standing, three way that I believe is worth adding to your list. They only cost $1000/pr, same as your 684's, but they easily compete with the CM series. I was amazed when I compared the UF5 to the CM7/CM8/CM9. I found it to be much better everywhere. (I sold B&W for 16 years, very familiar)
ELAC has another line, Adante, to be released in June that will have a $5000/pr 3-way, floor-stander. I imagine they'll give the 804D3 trouble for half of the price, but of course need to compare first.