Vintage Japanese DD Consult and Suggestions Please

@laaudionut from your list I would recommend to look at sl1000mk2. Without tonearm you may find one in good shape, with clear dustcover, fitting into your budget. There are plenty relatively cheap arms’ easily adoptable to it’s original plinth. Advantage of this approach is excellent reliability+performance of SL100MK2 deck! 

Smaller (similar to DP80 setups) excellent ’n’ "audiophile rated” DD oldie deck is Technics SL1200MK4, which definitely will be in your budget range. Advantage of that deck is in titanium tonearm, which I think is still one of the best for SL1200 platform. MK4 is capable 78/45/33rpm speed, and nice RCA connectors on the tonearm base helping to check phono cables.. MK4 was sold only in Japan, and you may need small step-down transformer (such as inexpensive TP-811 japan made one), or replacing original power transformer with any SL1200MK2/3/5 US 117V transformer (obtainable). 

"why not buy a new Technics or comparable unit” ..because of x2/x3/x4 price vs well performing/built vintage? Also, some fellow audiophiles want to spend some time building systems, aka hobby. 

@lewm +1 “JP Jones owns both and conducted a meticulous comparison test, using measurements not “I like it”. He shared some data with me, showing no significant differences between the two."

I hear very small, both direction, mostly record and cartridge driven difference, between: SL1200MK4/SL1200GAE/SL1000MK2/SP10R..

SP10R with EPA100MK2 arm wins clearly only on excellent quality records.. for so-so records, there is no difference! as of measurements, it’s the same story, precise/low-noise-dist test vinyls is hard to find, mostly I have are lower quality than best music vinyls..

https://hifi-wiki.com/index.php/Technics_SL-1200MK4

MK4 was an adoption of verified by DJ's hard usage design for audiophiles, with adding very expensive titanium arm, RCA on bottom of arm, 78rpm option, and heavy mat. end of 90s that table was priced ~ 1200, which is approximately four grand today! Number of units released was very limited..

SL1200G/GAE is nice, but cost is x3 times of MK4..

The main issue in buying vintage electronics is reliability, aging major components in it, and expensive repairs.. there are not many techs left these day, who can help, unfortunately..

laaudionut, ls1200g power supply design covers 100..240V 50/60Hz AC, I haven’t found power board difference between diff markets targeted product, in service manual.