Mid life crisis yields open check from the wife.

Well not exactly, but have I've been granted permission to invest $10K into anything I want. So, my choice is to upgrade my McIntosh MA6500 integrated amp and Monitor Audio GR20 speakers.
So, the only criteria is another integrated amp( I'm leaning towards tubes with phono stage) and possibly monitor size speakers. Used.
I would appreciate any advice or suggestions you could come up with. Thanks in advance.