Wow, you are so lucky to have them breaking down your door like that! I'd be very tempted to bring them both home and see how it goes. Yes, I think you should, so now you have MY blessing. Kia sounds like a charming little girl and I'm sure she will blossom by not having to share with so many siblings. One thing that might bias me in Kia's favor (if you decide you can only take one of them)--she might have more difficulty than the other one in finding a new forever home, being a little older and not having the glamorousness of a Himalayan. I've always wanted a Himalayan too, but I've never met one who needed rescuing. I wish you wisdom and luck in making the right decision.

P.S., take 'em both!