I would concur with the last two posts from 8200 owners...and I'm not selling mine. I am running two Maggie 3.5's, which have been purported to be a current-hungry, difficult load to drive. I'm not an engineer so cannot refute or confirm, but I am very happy with the performance of the 8200 MKI on the Maggies. Concert-level SPL, wonderful airy top end, liquid midrange, substantial and controlled bass. And of course, transients are wonderfully immediate...though that may be more because of the planars than the upstream gear.
FWIW, I have been told that the 8200 MKII resolves bass better than the MKI, but have not heard the MKII so cannot verify.
Personally, I don't feel the 8200 is bright. At least not with my Maggies. As you haven't selected speakers yet, perhaps system synergy will have a lot more to do with your final outcome than simply the Plinius examined in isolation.