Stay with H340, for me X5 isn't worth this money. I didn't compare this players on the same time, but iriver have better analog sound, when fiio is flat and you don't listen music with fun ;) Technically there are similar.

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Is it better than MM 02 US ?

Audinst isn't worth this price. I will choose Asus STX definitely to PC

uDAC isn't good dac in that price, definitely better is Maya U5 For me U5 = Audinst HUD-mx1, mayby when you change op-amp than will be better I think E7 + E9 will be best choice in that range price, you can search used E-mu 0404 usb too

Yes, it's work on Linux   Quote:    

Anyone compared HDP and Icon-2 ?

You can use Foobar too.

Choose MM 02 US, it's great DAC in that price. I compared Audinst with Audiotrak Maya U5 and it's the same class of sound.   Quote:   I had MM 02 US, I really liked that, but now I'm looking for something better. What can you say about...

This sound card is better than uDAC, I compared with Audinst too and it's the same class.

Sony X  has best soundstage I ever heard

MM 02 US + Topping TP21, IMHO better than Audinst or uDac2    

Audiotrak MAYA U5  MAYA U5 is a new product of Korean manufacturer. Earned special recognition  products such as Prodigy HD2 and Prodigy 7.1 Users praise especially value for money products Audiotrak.  How will this time? Convince yourself.  In box you can see: - Maya U5 card ...

IMHO $150 is max.