Good question @szore and does the Marantz sound more like a McIntosh than the others?
The Luxman's and others aren't powerful enough. I lived in a 2 - 16 wpc class-a SETs for almost 20 years! Been there. Moving onto something different.
And some are Great but way too expensive! Twice the price of the PM-10.
The Hegel is an option to ty but its softer and smoother, much less punch and not likely the best match for my system. Im using a large pair of KEF Reference 4's and they are very revealing and can serve up plenty of bass if thats what it sounds like. Id rather control more of the warmth or detail through the source. But I dont like dead neutral amps like the Yamaha's and others. I find them too dull.
I do have almost 300 hours on the PM-10 now and its bloomed. Its really rather fantastic. I do have about 30 or so days to decide if im keeping it.
@jbhiller I loved the Ruby. The PM-10 was much more of a difference and upgrade than I bargained for. But its Very revealing and will be brutally honest about what it thinks of your sources and speakers. For good or bad!
Lots of good feedback. Thank you all.