I just checked out the links to the ones you found. I don't know what you're planning to spend, but if this is to be a stop-gap hack, what I'd consider is resale of the unit, either as a hack, or as just the bike and keep the car to put on your next machine.
Of those machines, the SR500 has a cult following (as does the guy's SRX600), so it might be a good buy. Either of the BMW's ought to be good too, though the old BMW seems a little high since it doesn't have a BMW car on it. I would be leary of the Zhuzhou "Chinese copy of the BMW R71." Sounds/looks to me to be more a Chinese copy of a Ural (which is a Russian copy of BMW), and they (Urals) haven't had the best reputation for reliabilty and their performace is LOW. If Chinese copies of Russian motorcycles are anything like Chinese copies of Russian firearms, the Russian stuff is better. The '05 Urals have made some improvements over earlier ones, but I'd still give 'em a year or more to see if they're enough.
(I do have a Chinese copy of a Honda 50, and it's not too bad, but came with a few faults - like a cross threaded spark plug and an ignition module that didn't last thru the first tank of gas.)
I know a guy with a '99 Ural hack. It looks like a 20-30 year old bike... not in styling, that's more like 60 years old, but condition. The thing is corroded, the rubber parts & paint look very aged and cracked. He says it'll do 55-60, but won't ride it over ~45, for fear of blowing it up since it only has splash lubrication. Recently, he took the car off it and put it on his Harley so he could "hack" the freeway.