There are many excellent suggestions so far. If you are casting a wide net;
I just updated my preamp (to Audio Research) and as it burns-in my biggest impression is that my Ayre Amp (V5-xe w upgraded capacitors: 300 W) sounds great - voicing is as-good-as/better than many more expensive SS amps that I have heard in shows and at showrooms: I do NOT feel the need to upgrade my amp to make the ARC preamp sing.
This morning AG has only one Ayre Amp, the higher-line V-1x, for sale (at The Audio Room, below $5k). Refreshed w new Caps, you may find you saved $20K.
I have no affiliation w Ayre or The Audio Room.