Amp recommendations for Hifiman HE1000 V2

Are you considering running your 1000 V2 direct from the Lumin X1's XLR / RCA outs?

No, lumin into amp as a balanced XLR, then amp out to the headphone. 

Got it. The Lumin X1 is widely reviewed which will allow for a feel of it’s "sound / personality." I’d look to pair it with an amp based on your preferences and goals which in turn is driven by where the HE1000 V2 falls for you and what you want to achieve as an endpoint.

The X1, in my opinion, is a terrific front end for your build.

OP, my favorite amp so far with those phones has been a Yamamoto HA-03 headphone amp, rated at 1.4 watts and it drives them beautifully, the amp I run most the time is the Moon Audio Dragon/Dennise Had Inspire, also rated at around 1.5 watts. The Hifiman 1000v2s are gorgeous sounding headphones with everything I have tried them with but really do get sweet when matched well. I have settled with the HEV1000v2s as one of three sets of phones I am going to be living with and would like to get other peoples opinions of after market cables, so far I have settled on the Moon Audio Silver Dragons to be my favorites and do very well with both my Audeze LCD2s and LCD3s as well. What say you? enjoy the music

The Topping A90 is neutral but has a touch of warmth. It's a fantastic amp. Any headphone can perceivably benefit from amplification. (Regardless of impedance)