suggestions for headphones to match Mytek Brooklyn Dac+ Audeze LCDX ??

[Menuhin]

Greetings,
I own Mytek Brooklyn Dac+ . It is connected to a Innous Zen Mark 3 for streaming music.
I would like to purchase new headphones but I don't fully understand how to match headphones to a Dac from technical point of view.
The Mytek Brooklyn Dac+ has the following specs for the headphone output.
HEADPHONE OUTPUTS: Reference High Current,
High transient Headphone Amp, 500mA, 6 Watts,
dual headphone jacks, designed to drive hard to
drive headphones.

Are there any examples of headphones that would be a successful match?
How is the calculation and considerations whether or nor these two would be a match?
Would attaching a valve headphone amp to the Mytek be possible?

I was particularly interested in the Audeze LCDX headphones:
Maximum power handling 5W RMS
Maximum SPL>130dB
Frequency response10Hz - 50kHz
THD<0.1% @ 100dB
Impedance 20 ohms
Sensitivity 103 dB/1mW (at Drum Reference Point)
Minimum power requirement >100mW
Recommended power level >250mW

Would the Audeze LCDX match the Mytek Brooklyn Dac+ ?

Thank you for any help you may have,
Kind regards,

 

[Menuhin]

@Menuhin - Great DAC. I would kindly suggest you check out Head-Fi. You will find a ton of information that I think you'll find very helpful:

https://www.head-fi.org/forums/

Thank you.
Now I am intersted in the Hifiman Ananda's. I listened to them and just love them.
Transparent, realistic timbres of instruments and great staging and imaging. Not thick and overly warm.
Cheers!