Off the top of my head the 1st semi-arboreal that comes to mind would be Thrixopelma ockerti. My own experience with Thrixopelma sp leads me to believe they tend to have a wider range of behaviour than my adult female Gbb. My Gbb isn't skittish at all she's really calm and tolerant of any disturbances in her enclosure. They are as you stated very hardy and extremely easy to keep that's probably 1 the reason they are so popular. I keep my adult Gbb bone dry with a water dish, although these can and will sometimes burrow I decided to keep mine in a terrestrial set up with only a few inches of substrate and I gave her an hide to use and climb on this also provides anchor points for her to Web from. Finally a small downside at 1st is the amount of webbing they produce makes it difficult to get to water dishes etc but you should be fine with that. If you find yourself wanting a T ockerti and can't find 1 in the Netherlands pm me and ill point you in the direction of some cheap slings he also as Gbb slings lol
GBBs are terrestrial for the most part, although they do have semi-arboreal tendencies in captivity if provided with such a setup. They're heavy webbers and usually will build big web-castles, ignoring offered hides (or incorporating them in some way). They prefer bone-dry with a waterdish, no misting.
These spiders are insanely skittish in my experience. My juvie can fly around the enclosure like nobodies business. Which seems pretty run of the mill for this species. Also not afraid to kick those hairs. I've only seen a threat posture a few times though, for the most part it just raises it's abdomen and spreads it's spinnerets as far as possible lol. That's when I know it is not pleased...Interesting spiders.
They are an odd species (okerti that is). They do have the body type of a terrestrial, but I've had a few for several months now and none of them spend much time at all on the ground. I have them housed like I would an arboreal, and they do act the part. They are insanely skittish, but also excellent hunters and one of the more underrated t's in terms of good looks. They are quicker than one might expect.
I didn't mean just after it rains. I meant serious flooding haha
. Talking about ockerti though, not gbb. I've never been to Peru (or more specifically where T. ockerti are located in Peru ) or know/read of anyone who has done any real studies of these guys in the wild so I'm not sure if it's just a "folk tale" or not though. 
I'd probably get an Avic (preference goes towards A. avic or A. versicolor) over a Psalmo personally. When it comes to a first arboreal anyway.
. I encourage new owners to do the same!
There's a number of species out there considered "multi-biters", but I wouldn't count Psalms towards that. To my knowledge, they bite and run. Haplos however, and several other asian species, are famous for that multiple biting - I remember a report from a shop owner unpacking an H. lividum female. She escaped, ran onto him, under his shirt and bit him multiple times into the back. Can't imagine that having been fun, but I will say I suspect one reason for those multiple bites was the fact that the tarantula was "trapped" under the shirt feeling it on itself all the time and probably got irritated even more so.I'd probably get an Avic (preference goes towards A. avic or A. versicolor) over a Psalmo personally. When it comes to a first arboreal anyway.
I hear that versicolors can kick hairs but mine never has. A. Avicularias need to "press" their hairs into their assailant if I remember correctly. But my main reason for saying Avic over Psalmo is the less potent venom and willingness to bite. I think that the venom from Paslmos is a bit stronger. Plus from what I hear they tend to bite more than once (irminia is usually cited for this). An Avic is more likely to just run and/or shoot poop at you.
I've never been bit but I also don't handle my tarantulas. Hopefully I can keep it that way
Both are very nice species to have. Be aware the Euathlus sp. "red" are dwarfs and don't really grow above 2.5" in legspan. But they're probably the most tolerant species to keep in terms of interaction with the keeper.