I'd lean towards the Unico, Moon I-5 (NOT the I-3, it's a different animal), and maybe also the Classe's, though I've heard them at times sounding a bit too dry/dark for my personal taste.
One other thought: Audio Analogue Puccini SE Remote (or non-remote). I used to own this, VERY musical sounding, though it only does 50wpc. Still, depending on how loudly you listen, it may fit in. I had compared it to a YBA Integre DT, Aronov LSi960 (tubes), and a Bryston R60. The AA was the cheapest, and the most musical. It had a slight lushness int he mids that was a coloration, but was so pleasing I loved it. It may mate very well with the NHT's.
If you do look for it, only look for the SE version. Additional power transformer and some other additions, resulting in better bass and dynamics overall.
Good luck !