Budget Audiophile Looking For Amplifier Suggestions

Whatever you do get the very best you can possibly afford stretch if you have to.  Great old gear is great stuff. Mediocre becomes. ....,This is a golden rule of buying used and older things.  Think in terms of the best gear you can, go from there.
 I cannot make a direct recommendation because I use tube amps,  with less juice than you need want etc. I once, owned a big MF integrated and didn't like all that much.

Surprised no one mentioned Krell's class A biased amps, I once wanted one.

A 12 year old Krell is now at that price point.   My philosophy in buying used is to buy the best you can, not buy budget gear used.  If buying bang for your buck stuff,  buy new.

McIntosh has a signature sound that does not appeal to all of us hi fi people.  Some think of it as being a notch below what really good gear should sound like despite it's universally appealing blue meters and stunning prices.  It is solid stuff, made right here in the U S of A and nevertheless, must be  in high demand to sell for those prices, which are never on sale, if new and current.
I own an ancient SS small power amp by McIntosh, which synergizes remarkably well with my old Klipsch La Scalas and Heresys.