I hear Siamese's can be loud but they are a very sleek cat, also I've never seen a "big boned" black tabby. I own a Blue Russian, kinda chubby, but not really fat. Some stresses people complain about are litter box smells, but I've never had that problem. I don't use clumping litter, it can be bad for your cats, and plain old clay litter is flushable and better for the environment. I only put a small amount of litter in her box and change it twice a day so it's always clean. I hope you find a great cat, there's plenty at the shelters.