Have JBL K2s...best Amp pairing please?

Get a secondhand Boulder amp. Their amps have always been in the top category. 

Good choice of speaker... imo, the Luxman M10X would be end game and the correct choice of amp for that speaker. While sounding immaculate, it can keep the JBL in check/ from offending you, in case you had some less optimal or terrible recordings sometimes.

I have a the Lux near predecessor M900u and paired/studied it with different types of speakers.

I’m curious about the new Audio Research SS gear about to come out, but if you’ve heard a Luxman M10X or the MAC 611s or other SS amps, would love to hear your assessments please. Want this to be my end game amplification as well, I’m not getting any richer or younger.

Congratulations!   I heard the K2's at T.H.E. Show.   I went back to that room several times since I couldn't believe how sublime it sounded compared to the other rooms.   They were driven by Mark Levinson electronics.  Don't recall the specific model.

Thank you gents, your enthusiasm for my speaker choice makes me feel good about that expense! 

Great speakers!! Maybe the MC2301 1-Channel Vacuum Tube Amplifier

Mike