As I've said before: there really is no substitute for trying a few models out, I'm afraid. The tenor is the hardest of the recorders to stretch, on average, but different players have different issues. The single most tiring reach is not the right pinkie finger for most, but the left ring finger, but lateral flexibility of fingers makes at least as much difference as finger length, and you can have relatively large but inflexible hands, and that will give as much difficulty as smaller fingers in the more flexible hand. Weight is the other consideration, hence the thoughts around a knick instrument - but the flip side of those is the need for a thumbrest to stop the thing sliding to the floor - a straight one, held out correctly, won't always need that: I find thumbrests annoying in the extreme because they never quite seem to be in the right place for me
Cheap? Plastic it is, then - and others will be able to advise better on good makes. It's also lighter to hold, which can be an advantage, and though you get just as many condensation problems, at least it isn't damaging to the instrument, only annoying. I would though point out that I have played my wooden instruments intensively for a week's course and not had problems with them: properly looked after, a good wooden instrument will cope fine
. One thing I would suggest is not making the tenor the only instrument you play - it's relatively limited in repertoire.