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kittykitty there are a few reasons why you don't see many with just one Savannah. They are incredibly addictive and possess a highly specialized power that makes you do things you never thought you would in the past. Specifically, you find yourself purchasing an inordinate amount of cat furniture and toys, you rearrange your things to ensure the cat is happy, you give up 3/4 of your bed, you shrug your shoulders when there is a cat (or two) staring at you from the counter while you are preparing dinner and you don't blink an eye when it sounds like a herd of elephants are running through your Living room, even when your house guests have jumped out of their skin at the noise. Shortly after getting the first, you wake up and say "you know what would be better than one crazy cat? Two crazy cats!"
All kidding aside, these cats are very unique in many ways. Even though they aren't lap cats, they are not at all aloof and want to be with their people. I can't offer you expert advice but will share my experience with my own cats, both F2bs. My male kitten is on the upper end of the needy scale, he is also on the upper end of the energy scale even after adjusting for the Savannah multiplier. He is intense in all he does, be it his love for me, playing, or getting in trouble. He would be miserable as an only cat. My female is intense as well and is a genius at figuring things out, like opening doors and turning on faucets. She is high energy, but nothing like Kovu. Even though she isn't as crazy as Kovu, and she did have our Chihuahuas as friends, she is clearly much happier having a stampede partner. She is trying to convince the chihuahuas to accept Kovu in their pack (Nyah will sleep with them, it is so cute), but the dogs think Kovu is the Chubacabra. The dogs might be right.
They don't sleep as much as cats traditionally do, but that might be because mine are still young (17 months and 6.5 months). They typically sleep with me at night, hogging up the whole bed so my husband and I have a square inch for us. There are occasions, though, where they are wrestling, wiggling, racing with the bed as a key obstacle on the course, etc. and there is nothing I can do to make them go to sleep. I kicked them out of our room just the other night because of their antics. I think you have to understand you will need to flex to accommodate them as it rarely happens the other way!
I would certainly talk to the breeder about personalities of the kitten and siblings. I would also soak up the advice from the breeders on here. I think questioning if this is the right generation for you now is a very good thing rather than after the fact. Regardless of your decision to move forward with this kitten, or if you decide a better fit is a later generation, you will find a ton of support here!