Maybe Vintage TX will chime in. He knows a ton about these RTRs.
I like the looks of those older RTRs, I have a Pioneer RT-1020L, but I'm told that the they got better as time went by and the decks from the 80s offer better sound. I sold a real nice Tascam 32 a few weeks back that I would have kept if it could have handled 10" reels.
So I'm always lookin', but not real hard.