Newbie HiFi Headphone & Amp pairing suggestions

My Gear (for the last six years):
LCD-X / HD 700
Mjolnir (first Gen) / Valhalla 2
Gungnir Delta-Sigma with Gumby in the chain (a year or two) as well.
Water / Yukon - RCA / XLR (more recent)
LCD-X is Lush (good tone, separation of resonance) and fast.
HD 700 nice as in much better than HD 6xx series good Resolution and
my preference for GoTo and extended listening (dynamic drivers!).
LCD-x ... heavy ... shorter times but very engaging.
Don’t hesitate to try HD 800 / 800s - very detailed.
Having plenty of power is a stand out quality for me (Schiit delivers).
The Valhalla 2 sings with Water ICs, with Mjolnir and Yukon is a bit less detail (it seems) but a better DAC should prove to be better (all around).
Headphone gear shares my desktop (smallish) with Monitor / Keyboards / Router / Streamers ... a bit crowded but functional.
Look into HiFi Man latest models as well.
A component set up my prove best all around.

@fourminutesong -- Yes, Audeze are very heavy. If you plan to listen for more than an hour or so, I can tell you that you'd notice the weight. But IMO, you get used to it. 

My current setup is a Node 2i >> Audio Mirror Tubadour II DAC >> Quicksilver headphone amp (tube-based) >> Focal Clear or Sennheiser HD6XX.

If you can find a used pair of Audeze LCD Classic, I say go for it. Even if you don't like it, they are easy to sell in the used market.

A very good headphone amp for $400 or $500 is the Topping A90. I compared it directly to my $3K Benchmark HPA4 and it is pretty close. Neither of those 2 are warm. However a warm DAC like the Audio Mirror Tubadour may be nice with them and give the warmth the OP is looking for. Given me a few days to test that last part out.

Went with ordering the LCD-2Classic. Excited to get them.

What do you think of the Mytek Brooklyn Dac or Brooklyn Bridge? I need the headphone amp and a DAC so thought they may be good together. 

I use the RME ADI-2 DAC. Aside from its DAC, it can be used as a preamp. It has a headphone amplifier. A giant killer, it comes with a remote, various filters, switchable crossfeed, loudness, and EQ.