How about a cat of similar age? Ask for a social one, as he seems to like to cuddle with other cats. Also maybe one with a similar activity level (e.g. a Siamese might be to much energy for yours). But in the end you know yourcat best and need to try it out.
Also think about what you want. They should be somewhat compatible, yes, but its okay for you to want a cat to play and cuddle with, too.
So decide what you need and want, trust the people working at the shelter and your gut on this one.
Good look finding your next family member.
Sister 1 is #7, nothing she wont gobble down Sister 2 is #8, her true form is liquid to the point you wont understand even how