Dan D'agostino classic stereo amp + Dartzeel NHB-18NS

Thanks George for your input, that's very hepful.
I'm pretty optimistic about the combination of these 2 components.
The NHB should bring a little bit of tube like warmth to the speed, transparency and slam of the D'agostino classic amp.
Thiel CS 3.7 needs smooth liquid sounding gear.
This combo should drive the 3.7s to their max potential.

Wonderful combo will sound great enjoy and be well.

tube like warmth

??? That means colouration to me. It should sound the most neutral, compared to others.
If it behaves anything like an LDR based passive volume control which it sort of is, it does have a small gain section which I believe can be switched out, then it should sound like a direct source to poweramp connection, a transparent and dynamic sound, with the least amount of colouration, given a great impedance match, that you have.

Cheers George

FWIW I mated a Krell Phantom two box pre with my  Agostino  momentum amp. Actually directed that way by a top Agostino guy that knows Krell inside and out. The 222 one box version would please as well. Really love the phantom pre. 

If you guys have any other preamp suggestions to go with the d'Agostino amp, i'm open.
I'm looking for a top notch combo under $50K to build my reference system that's why the Dartzeel will be hard to beat for the preamp part.