Which new amp to get?


I’m thinking of getting a new power amp to replace my 25 year old Audio Research VT 130 SE.  My other equipment includes KEF Reference 5 speakers, Audio Research LS 22 preamp, Audio Research PH 3 phono stage,  Innuous Zenith 3 server, and Auralic DAC. My room is about 24 x 18.  I’d like to keep using the Audio Research preamp and phono stage, and I’m leaning towards a solid state amp more because of convenience than for sound. I’ve received several good recommendations from dealers but am getting confused by all the choices.  So far, here are the nominees: Coda 8, Krell duo 175xd, McIntosh mc312, ps audio bhk250.  All are solid state in the $6-7,000 range, which is my price point .   Other suggestions have been Airtight (tubes and expensive) and Audio Research (more tubes and they make the VT80 for $9500.. possibly not enough power..but the next step up is close to $20,000).  I’m open to considering others.  Mainly, I want an amp that’s long lasting and low maintenance, pairs well with my preamp and phono stage, and compliments the KEF speakers, especially their great imaging and sound stage.  I’d appreciate any input and also hearing from those who own some of these components.  Thanks. 
fast
The nice thing about a lot of modern high end tube amps is the Fault Protection and Auto Biasing features.  The OP has invested at lot in ARC maybe keep it all in the family.
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I sold my $11,000 pair of Classe monoblocks and got the ps audio bhk250. Great amp. Try it with the default tubes and then get an updated pair so you can use the default tubes as backup. The bhk 250 has a lot going for it: quality parts, 4 speaker posts for bi-wiring, great SQ, and quite a bit of power.
Zesto Audio Bia amp is a great, easy to use (no fuss) tube amp.  Though I know solid state is what you seem to be targeting