High current amp search

Coda NO 8 for sure. Good luck with your search.

Wyred4Sound SX-1000 for $3K brand new. 40 amps.

Parasound A21+.  Easily available new about $4k, bit less used.  Plenty of power.  Matched it with my Wilson Sabrinas (Wilsons are notoriously hard to drive) and they came alive better than any other amp I've tried with them.

OP - What speakers are you driving? I understand the problems with underpowered amps, myself. I have a pair of Martin-Logan Sequel II's that I originally bought with an Aragon 4004 power amp. It had the juice to run them great, but I later upgraded to a used Krell 200-S with the same power ratings. Everything was a bit more refined with the Krell, but still had the weighty slam of low bass. Unfortunately it was fried by lightning and due to budget issues at the time I settled for a Vincent 331. I need more power to be happy. I would consider Krell, or especially a more recent Mark Levinson, like the 332 or 333 series which can be found for about $3,500 used. The big drawback for them is they weight a ton, like my old Krell. I'm 65 years old now so the weight does make the decision tough. Similarly, a very good friend of mine has Sound Lab A1 full range electrostatic speakers. He has always had a fantastic sounding system driven with Jeff Rowland electronics. Jeff makes some nice mono amps that I would consider, but they are more difficult to find on the used market. I haven't heard a Class D amp that impressed me yet, unfortunately.

I’d listen to Ralph! Plenty of great speakers out there that might make it easier for your amp.