D'Agastino Momentum vs Dartzeel NHB108

I've heard all the D'agostino amps in my system as well as the Dart 108 and the MXR-20s. The D'ags got my vote but there is something special about the sound of the Dartzeel. Listening to the 458s is high on my list but I have to make sure I have the coin ready to flip should I find them inexplicably irresistible. 

Thanks for the responses folks........I ended up getting the Dag, and it's pretty hard to fault.  Obviously a great amp which is very responsive to the gear around it.  I found it to be fantastic with Purist power cords and a tube preamp.  JTinn.......I'm running Tannoy at 96db so yes I think the Dart would have also been a good pick, although the Tannoy do love the iron clad grip the Dag has on them.

I’m interested in the NHB-108B. I’m also very interested to see that they illicit a $130,000 pair to make a comparison. Apples and oranges I would think, but interesting. For my mastering studio I’m looking for lower power, as I sit 7’ away in a controlled room (mastering) and the NHB-108 B would be replacing tube amps, highly modified Class A Push Pull Cary 211 FE. The pre amp is solid state and very, very good, Crane Song Avocet - balanced out. Speakers are Allegra by Joachim Gerhard, with external passive crossovers done by Jeff Glowacki @ Soniccraft. Bricasti M1 SE DA. Thoughts on the 108 B in this setting anyone?? Thank you

@brianlucey have you considered the Bricasti M15 or M28 amps? Since you use the Bricasti M1 it might be a great match and I'm sure you are aware many recording studies use these amps with great success. Have you had a chance to hear them?

(Dealer disclaimer)

Look at Luxman M900 with its match preamp C900.