A lot of advice provided in this thread...
Because you have a really nice, clean and simple system - Nottingham into your VAC integrated (love that amp, and I am vinyl based also). I think match the integrated to the speakers (think 93bd and up), and the speakers need to match the room...
But my experience says go for something like the Focal 1038. It is as good as the Sopra's 2 or 3 IMHE, with bass more like the 3. Easier to drive with tubes than any Sopra (I have heard them just Rock out (loud) to large Brahms or Miles KOB on as little as a 40w AudioPrism EL34 amp in a 12x27 room). The 1038 is a large speaker system, but small enough for a good match with your integrated, will fit a lot of rooms.