tgm, the Plinius 8200 Mk II is supposed to be a significant upgrade from the 8150/8200 versions and used ones appear now and then. I haven't heard the 8150 or 8200, but they are supposed to sound very similar to the 8100, which I owned before the 8200 Mk II (my system is Marantz SA14 > Plinius 8200 Mk II > Meadowlark Heron i's). To my ears and in my system the 8200 Mk II retains the Plinius house sound (e.g., the harmonically rich character), but extends the frequencies, with tighter bass and a wider soundstage. YMMV, but it's definitely worth a listen. The Concentra II was my other choice. It looks better and has more features, but as I recall it was quite a bit more money and, as you pointed out, it's not a perfect fit for everyone either. The comments of John Marks in Stereophile and the Absolute Sound convinced me that I couldn't go wrong with the Plinius and that it was a good buy. Good luck.
Adam
Adam