Maus from the right breeder are very laid back. Mine are nicknamed beanie babies they're so "limp" and relaxed. But if you go to cfainc.org you can look up the personalities of all the cats. Some Bengals are very pleasent, others are wild children, so make sure you get one you can live with
tehehe.....amen to the commebt about persians being the laziest cats ever lol. *eyes all of hers who are passed out while the moggie kittens are running wild* but i do love my lazy little fuzzballs.
Ocicats are very active as well, Have you thought about one of them? I know that a lot of mellow breeds would be a good compliment to your active one too. . .