I was waiting for more experienced people to chime in but let's review some choices after I did a bit of research. (Impressions I got from others who have reviewed them.)
$150 Aune MkII - Supposedly just OK stock but can be improved alot by switching out the op-amps and possibly using an 18-volt adapter instead of the 12-volt. Probably only a good choice if you intend to mod it, others may be better stock. (very pretty amp though)
$180 Audinst MX-1 - Not as pretty as the Aune but it seems to be excellent already in stock configuration. Supposedly better than the popular uDAC, Like most amps, may need a fair amount of burn in to sound it's best. Looks like a very good value.
$120-130 Zero DAC - Also supposed to be very good stock but popular for modding. Looks like a great value from the reviews.
$200 Maverick Audio TubeMagic D1 - One of the most versatile choices and looks very nice, so far I've only seen good reviews. I would keep this near the top of the list if you have enough space.
$245 iBasso D10 Cobra - iBasso is well respected and all their products are supposed to be very nice, particularly seen the D10 suggested alot; including to be used with the Ultrasone Pro 900. It's portable and compact but I don't think it sacrifices anything for it's size.
$237 Audio-gd NFB-12 - Looks like a really great value and all their products get excellent reviews. I would expect a product like this to go for something like $500-600 instead of $237. The DAC section is supposed to be particularly excellent.
This is just the impressions I get from the reviews I found. See if anyone else has any suggestions. There are many other choices including alot of inexpensive tube amps/Dacs from Darkvoice and others. Really depends on what you want, how much space you have, whether you need any pre-amp functionality in the future and such. whether you want to try different op-amps/tubes or just plan on leaving them stock etc.
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