I'll second the Legacy Calibre. I have the XD model and I bi amp them with a Rogue Cronus Magnum running the mids/highs and the powerful XD internal amps powering the bass.
They are like a floorstander in a big bookshelf package. The have an 8" woofer with two passive 8" radiators, a 7.5" midwoofer and a large AMT ribbon tweeter. Not many bookshelves can boast of that kind of firepower. The drivers are all substantial, high end components.
Highly recommended.