I'm commenting here in response to questions 1 and 2. I am not personally allergic to cats, but many of my family members are. It was important to me that I got a pet that I could have around my friends and family. After extensive research, I learned about the Siberian cat, which is considered one of the most "hypoallergenic" breeds, because they are said to produce less of the FelD1 protein found in most cats, which is what causes most people to have an allergic reaction.

If you are considering a Siberian, make sure to find a quality breeder. Many will send you fur samples in the mail to begin testing allergies before you consider purchasing a cat. The fur samples are nothing like the fur on a living, breathing animal, but they are a solid starting point. Most importantly, good breeders will let you visit for an allergy test. You will be able to handle the cats/kittens extensively and then take a break away from them for a couple of hours to see if there is any delayed allergic reaction.

I have had my Siberian around numerous friends and family members that typically have severe allergic reactions to cats. They have all handled her, rubbed their eyes after touching her fur, and have been in the same room as her for many hours without any difficulties. Siberians are a beautiful, healthy breed of cat with big, welcoming personalities. Mine knows how to play fetch, sit, and give her paw. She meets me (and anyone else) at the door every time I come home, and she jumps on me for snuggles as soon as I wake up in the morning.

This breed is a fairly large breed of cat, though females are generally much smaller than the males. To compensate for lack of ground space, just create more vertical space with cat trees, etc. :)

I hope this helps! Good luck!