Old school Krell is where I would go. I was warned off Plinius as they have heavy usage of multi-layer boards packed in that can cause issues. Never owned one because of this.
A nice FPB300/600 or a KSA250 is where I would go, if you wanted my advice.
I have always found the PassLabs power amps a bit weedy, the pre-amps are nice though. I own a very nice Gryphon pre-amp, lovely thing really well made and sounds delicate and detailed, I would imagine the power amps are equally good.
The older school class A Jeff Rowland are also nice, before they went all class D on us.