Used PS Audio BHK 300 monoblock or (2) new benchmark ahb2 bridged?

You could also consider 2 used Benchmark amps as there are plenty out there.

Thanks for the response! Yes there are a few used ones out there but nobody seems to want to let them go for much less than new!

Gold Note PA-10 in Bridged Mode. GaN Class A amplifiers that are awesome. I am using as SPL Phonitor 2 Reference pre-amp and Sonner Legato Duo and I mostly listen to Jazz, Blues, Classical. I also have the SPL Phonos phono pre. 

Benchmark makes great electronics that are transparent and are great for studio use. They measure well too. But that doesn’t translate to being the right fit in a home audio system. I’ve owned few benchmark DACs over the years and they never stuck around for too long including the latest DAC 3 HGC. I can totally see how these components can serve well in a studio environment but to me they sound slightly clinical and cold.
I never auditioned Benchmark amps so I’m just going out on a limb here to assume their objective was the same as with their DACs.

Also, interesting information…Benchmark amp is 11.04" W x 3.88" H x 9.34 " D - Including feet and binding posts and weighs 12.5lbs.
PS Audio BHK amps weigh over 80lbs.

There’s absolutely no such thing as giant killers. There’s no magic. You get what you pair for.

Between the two choices if I had to buy without listening would be the PS Audio BHK Mono Amps. You have a dedicated mono design, tubes, excellent power supplies.

Thanks to you both for the useful suggestions. I guess we've all been going back and forth on the "clinical" vs "musical" debate since hifi began - I'd say I'm somewhere in the middle - I have a feeling the BHK would work well for me but I find the specs on all benchmark equipment quite compelling. Too bad its so tough to compare these things head to head these days...