Not that kind...the feline kind

The cat that I have is about six years old. She grew up with a cat about five years her senior until Tolkien died about a year and a half ago. For a while I've considered getting another cat/s.

The best thing to do would be to get two kittens from the same litter. Then they grow up together. the catch is that I don't think that I really want to have three cats in the house.

The second idea is to get another grown cat. Hoping that the two of them get along is a long shot. Sometimes it works and other times its nothing but hissing and fights. If I did get an older cat I would have to make sure that I could have 'give-backs' in case things didn't work out.

My cat, Scourge, isn't spayed.

Does anyone have experience with integrating older cats into the same house? Would I be better getting another female or neutered male?

Tom