TOTL Headphone Amps

Yes , it drives my 25 Ohm Klipsch no problem.....    drives the Grados fine also.    This amp has balls !!!     The Neve is a fine amp but it is not in the same league.    The RNHP 's roots are in the studio, so it is clean, adds nothing...  it's great and it's unlikely I would sell it,  more likely I will leave it at my girlfriends house.

The QS is far more musical.... music just flows with layers of detail and natural timbre and decay ...  

Not a TOTL amp, but I saw the DARKVOICE 336SE OTL HEADPHONE AMP on MassDrop and looks very interesting. Never seen an OTL headphone amp before and I’m intrigued, especially at $200. Any thoughts?

Three noteworthy amps, from my experience:

Benchmark HPA4 - maximum transparency and detail, clinical in its precision 

Ampsandsound Bigger Ben - incredible musicality, a touch of warmth, lots of power

JDS Labs EL II - All-around solid performer at a budget price of $250

The Darkvoice 336SE OTL amp would be an interesting choice, haven't heard it but I imagine it'll have a distinct sound: alas, I've heard about quality control issues.

Wa33 Elite by woo audio

WA33 is probably the best tube-based option. If your preferences run Solid State I'd consider the HeadAmp GS-X mk2, and if aesthetics don't matter to you, the Audio-GD Master 9.