Plinius sa102. or jeff rowland model 6

I would have to third the vote for the Plimius amp.
I prefer the tonal qualities of Plinius over the Rowland line (which is also a very good amp). It's just my personal taste.
I've owned several Plinius amps and have settled with the Plinius SA Reference amp.

My friend owns the Plinius SA 102. It replaced 100 w 6550 tube monos. It's very good. It's an amp that a tube lover can appreciate. I had it in my system for a couple a weeks. At my place it replaced an ARC VT 100 mk2.
It's a little bit varmer than the ARC and the lows are superior. He got it back last week. I miss it. I never heard the JRDG.

The Plinius SA-102 is the best solid state amp I have owned... however, I still prefer a good tube amp from VAC or McIntosh.