Really nice bike's being presented here!
What are the worthy MTB brands to look for besides Trek? I think I'm leaning more to MTB frame due to 21"+ frames being more accessible than touring 25". Also I like the point mentioned by
zukahn1 that maybe MTB frame will suit more a gravel type bike and be more robust. Still I find MTB frames to be less aesethicaly pleasant than touring bikes - mainly boring paintwork (examples below).
By the way I have managed to find interesting 25" bike take a look. It's current price is around 200 dollars but the auction has 7 days left.
Nice Panasonic on Tange tubes, seller claims center-center frame is 57cm with a set of brand new continental tires. Not sure if it would be possible to fit bigger wheels there.
25' Giant Speeder, seller claims it has a little rust marks so the frame would need some work and maybe repainting.
Peugeot Mont Blanc 25'