I'm probably being really dense here, hope someone can explain.
I'm allergic to cats but would most likely be fine with a Siberian cat, as they produce much less dander than your average pussycat. I've looked at a few breeders' websites, but they all state that you shouldn't even bother contacting them if you're going to let the cat go out unsupervised (speaking as someone who had cats for over 20 years, HTF do you 'supervise' a cat outside?!).
Now, we live in the countryside down a private lane, nowhere near the main road. It's cat heaven here. What would be so bad about letting an outdoor breed like the Siberian go outside? They're not overbred so are very hardy and apparently excellent hunters - would be a shame to only have it hunt toy mice indoors...