Much as it pains me to say this, the Troll is probably a better option than an old bike if you have some money to spare. You can buy the old MTB and move everything over to the Troll frame, then when upgrade-itist/ "oh, that's cheap I'll buy that" hits you have the option of going to discs, boost rear, racks coming out your wazoo, fenders and 3" tyres whatever...
That being said I did some good tours on old MTBs The Shogun Trailbreaker 4 from the late 90's still stayed with the early 80s vibe, long chainstays and slack steering with rigid forks. Threaded though, I just used a quality stem adapter.