I would take the 40 or the Ultralinear over the Z10 for more headroom, that's just me. If you can do the integrated version of either that would be better than putting a Freya in front of the Berning designed amplifier (imo). Dave's amplifiers are full bandwidth, clean and dynamic. If you want to massage the sound, do it with your digital/analogue front end, cables, etc. The beauty of his designs are neutrally and lack of coloration. And no tube amplifiers control bass better than Berning ZOTL amplifiers because of the low output impedance, unique to the design.