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I think it's just the availability of species, in general, that makes arboreals tougher to care for. Outside of the Avics (which have a reputation for being fragile, which I wouldn't know myself since I've never really had an interest in them), most genera available are feistier, faster, and meaner (Pokies, Psalmopoeus, etc.). These are definitely a step above Brachypelma or Grammostola, and even the more defensive terrestrials. I give all species a lot of cross ventilation, so I'm not sure if arboreals actually need it more than terrestrials. Never bothered to find out.

Agreed about the enclosure choice. If you really want a nice display tank, then sure, spend the money for a customized fish tank or acrylic enclosure. If not, there are plenty of cheap options for housing any species. Even the giants, like Theraphosa, can be kept in large, cheap storage bins.

It would also really help if the OP could narrow the the list down to a few species, because most people are just going to throw out what they'd want themselves, or general beginner Ts.