I love these spiders! I've had one at home until I release her (1. it's not an good pet spider and 2. this spider is under nature protection). But a cool thing is - she molted at my home and I still have her skin in a little box. It's something that not everyone has.
In Poland these spiders aren't protected (we have still a lot of undammaged habitats where they can live in a large numbers). We succesfully breeded them, so if you know how to keep them, they can become a good pets. Of course, in your situation, you have to choose species that aren't protected. Maybe american species like D. tenebrosus or D. triton?