Health Dept standards are lower than most people will tell you to keep your CYA at... i like to keep mine on the higher side, between 70-80. Esp if you have a Salt system.
But it just depends on your pool and your chemical demand. Of course in hotter climates, pools that get a lot of use or are always heated, dark plaster, etc, you obviously want your CYA higher.
I've had pools with almost no CYA level and never had a problem with chemicals or algae, and vice versa. Just depends.
And make sure you use the good, domestic Cyanuric Acid, in the round brown cardboard barrel. You'll use twice or triple the amount of the import stuff so in the end it's not worth the cheaper price.