Tube amp advice

I am thinking of trying out tube amps. My current amps are Kharmas (MP150). My speakers are Wilson Benesch and they are not an easy load (sensitivity is 86 db, impedence 6 ohms).

So, it would seem I will need a pretty perky tube amp. Some research has shown me that the EAR 890 and the Rogue M-150's are good values in my general price range, are well regarded, and are powerful enough to drive my speakers effectively.

Any thoughts on how these two amps compare? Any thoughts on other amps that might work well?

Thanks in advance.

--dan