I always believed the story about the mixes who are healthier. So I have Filou, Abyssinian, who is sick with renal failure since he is 9. He is 14 now and while he is really old and frail now he still lives. And there was Tigris, Aby-Siberian mix of whom we thought he was the healthiest cat we've ever seen- and he passed away last September from cancer within 3 weeks
So- if your heart is with a Meezer- go for it.