Headphone amps

For a little less than the price range you're looking in check the Headamp GS-X mini.  Auditioned the Pass and Benchmark but liked the Headamp more so bought one :-).  Check out what's being said on Headfi about the Headamp.  Also don't shoot the messinger but you really should read the ASR review on the Pass before pulling the trigger on that one.

I have the Quicksilver Headphone Amp, it's quite good.   Plus it's a Quicksilver so it is built like a tank.  Huge value in my experience.   

@oddiofyl +1

I have both the Quicksilver headphone and integrated amps - both of which delivery excellent sonics at a very competitive price point.  As stated, build quality is also top notch.  My end game headphone amp may be the Pass Labs HPA-1 (at 3x the price), but frankly, I'm in no hurry to get there.

Since the ones you list are SS I would take a look at this https://www.luxman.com/product/detail.php?id=7

Doesn't look like many people answered your question about those particular amps. I wish I could answer but I've not heard them. I've heard some of the others mentioned, but that's not what you asked! 😁