Probably the Sphynx cat; it is very attention-seeking and affectionate, and its lack of warm, protective fur means it needs to be kept warm in the winter.
That depends what you define as cuddley.
If you mean softness and levels of fur then the result will be different to if you wanted one that also looked cute (to intensify the 'cuddley'...
I have had many cats and many cat breeds over the past forty years. I can unequivocately say that the Siamese appear to be the most intelligent but maybe only because they are so dog-like. The...