IDK what you would call a good quality breather. K&N makes some nice ones. I just run the pcv on one side and have a mopar performance breather on the other. It is nothing fancy. Has a chrome body with a foam insert. I have changed it once since I am sure it gets dirty at some point.

Check the pcv for proper operation too.

If it is the valve cover I like the fel-pro rubber coated felt. If installed right they really last even with manifold heat baking them.