Best Class A Amp under $2,000 used?

I would be fine with an amp that went into a/b mode after so many watts.  I'm assuming that it makes less difference after a certain volume level and would drive down cost.  Is that correct on both counts? What about specific models in the used 3 k range?  Any recommendations with the updated criteria? 

My Krell which is a class a/b amp runs class a for 50w and my Vandersteens are 86db/1 w. Not being a headbanger with the volume control and with the size of my room I don't believe the amp has ever run above that point. I like the Pass Aleph 5 class a at 60w and those are below $2000 and should work great with your Dalis.

Thank you @digepix .  I will have a look!

" Here's a pair of Aleph 2 monoblocks for $1,100"

Are you sure those amps are not counterfeit or prototypes? I had most of the Aleph's and none of them looked like the ones in the pic's.