Which vintage direct drive?

What about a Technics SP10MKII? Much easier to find than any of your chosen models, probably no more expensive, almost certainly more reliable and/or more easily repaired, and probably better to boot. 

I like all these suggestions and advice. Most of the models I listed were 100v Japanese models I realized. I like the idea of the vintage coreless/brushless DD, they seemed to have evolved into developing a more mature drive system. One of the things that is a bit tough to accommodate, is that the Trans-fi tonearm needs to be on the same horizontal plane as the top of the platter. This means that I have to get risers or make a new plinth. The Victor or Panasonic is at the top of my list, I think. I tried looking into an SP10mk2 earlier, but most of the sellers' tables had a lot of cosmetic damage. 

Getting the Trans-Fi I knew I was investing in a project, so I can be flexible. 

Yes, the QL-10 had the entire package of the plinth, tonearm, and drive system, but, I believe, the drive system is exactly the same, just 120v.

The belt drives I really enjoyed were an old VPI Jr. and Nottingham Interspace, although I did not like the arm of the Nottingham (man, could they make turntables but their arms were crazily overdamped ). 

My choice:
Luxman PD-444
Denon DP-80
Victor TT-101
Technics SP-10mk2
Technics SP-20 

from this list i think Luxman PD-444 is the best of them all in terms of usability for almost any tonearm, designed for two arms (long and short). 

Victor tt-101 is the most problematic, hard, expensive or impossible to fix. You may never find a working sample. 

Technics is great, but not for "9 inch arm. 

Denon is nice! 

Wolfie, I didn’t pay too much attention after I mounted the air bearing tonearm and listened for a minute - it was one of the second tier Technics, maybe an SL1500 mk2. Anyway, compared to the Nottingham Mentor (Dais bearing, modern motor controller), the DD was unlistenably coarse. To me. In my system.

I bought the Technics because it was real cheap and I wanted a second TT - but the Technics was not the answer, so I gave it away. Kept the Trans-Fi arm.

And agreed about the NA tonearm. About as adjustable as a concrete block.

Sorry for the long delay, injury kept me away. 

I've decided to mod a Dual 721. It's a brushless DD that is more reliable than most and very simple design with excellent measurements. I will make a plinth and pair this with the Terminator tonearm. Making the motor parallel with tonearm is the most important part. Next, would be making a quiet box for the air pump  (harder than it seems). 

Great suggestions though and I do appreciate the help.