Yes the 861 is the best one to go for. WPC don't mean that much with EAR poweramps . However 861's are like rocking horsepoo and expensive. Goes well with Tannoys
890 has grunt but is somewhat coarse by comparison
I had an 8L6 for many years and used it both in integrated form and then with an EAR864 in power amp mode.
It makes a superb combo with the 868 and even with my Hovland pre.
Don't be in too much of a rush to sell it on