Straightshot,
As pointed out before only your third choice is a true Mak. E. German Mak is the one to have, I'll explain below. Btw, Mak is the Glock of the '50s, reliable and simple.
As far as I am aware, Russian commercial, Bulgarian comercial, Bulgarian military, East German mil/police, and some rare Chinese Maks reached US.
What you are currently seeing in Shotgun News are: military Bulgarians made in '60s and at least the first batches sold were new in cosmoline with polished blue finish; there are also used East German in varying condition, also blue polished.
I used to own a Bulgarian military, and it was reliable, accurate (yes, with Russian ammo!), and it kicked like hell. The outside was nicely finished, the internal small parts looked like someone machined them with their teeth. But the parts were machined, and worked. Commercial Bulgies were rougher on the outside, so were Russians, and probably were rough on the inside.
Well I never shot or did a complete disassemblly of a E. German gun, but did dry fire them and they had much better trigger pulls. Also the finish was nicer. I think you should buy the E. German even if you have to put some work in it so it functions right. Most people do that with Walthers (PP/PPK/PPKs) and don't mind it right? I may hear an answer now "yes, but this is a $175 gun". Maybe so, but it's on at least equal footing with Walthers because those E. German Maks were made by Suhl/Merkel people (check out their rifles, and shotguns). So the same quality materials and workmanship went into those little pistols.
Currently, Mak is THE bang for the buck considering the reliability, price, price of ammo, and price of mags (for a while you could pick them up for $1.50 each).