Chuckbob
Savannah Super Cat
I've been moderately successful introducing a male savannah kitten to an 8+ year old female crabby tabby. She hated him for the first month, barely tolerated him the second and now scratches to be let out of the bedroom at night so she can go play with him even though she knows he will play far longer than she wants to.I agree with the advice of the others. If you have had an Aby you are familiar with what an active breed is like. Each Savannah will be individual in personality, and as Brigitte said, it will be important for you to communicate with Shelby what you feel will best fit in your home. Unlike the others, I suspect that since your Siamese grew up around your Aby she will most likely quickly establish herself as alpha cat with any kitten that is introduced into the family (especially if it is a male kitten), although as the others have warned, it could go in exactly the opposite direction.
I say moderately because I have never seen them cuddle or sleep together. They will share a sunny love seat but there is always a cats length between them. they will eat from the same bowl with occasional hissing. I think she actually missed him when he went to the vet for neutering and spent the night there. I chose a male kitten over a female as I thought Our 8 Y/O female would feel less threatened and the breeder assured us this male had the sweetest disposition of the litter. I knew they were high energy but my F6 astounded me. He wore her out and she hid a lot the first month. but now both have free run of everything and she sleeps in the middle of the floor with no fear. We quarantined him for two weeks and spent two more with very brief introductions with a lot of hissing and swatting. It was a very slow process and I thought we were never going to get where we are now with both cats on the couch at the same time. Loki is 6 months now and we can leave them alone together while we are at work and they get along great.