SPL s800 vs Metrum Forte vs Bel Canto ref600M

I’m looking to replace my Bel Canto ref600m power amps. Does anyone have any experience with the Metrum or SPL s800? I’ve read all of info, specs, etc. that I can find on line. The 600Ms sound very, very good. The other 
pieces I’m using are a Wolf Audio Alpha 2 server, a Simaudio Moon Neo 350p preamp, and a Metrum Pavane Dac. Every component that I’ve changed has been a definite improvement over what’s been replaced so I know the 600s aren’t strangling the sound. Wondering if I really need to change. Your advice would be helpful. Thanks