Well you gotta be careful when you install them its easy to make them leak, I replaced mine about a year and half ago with Felpro gaskets and also replaced the bolts that came with gasket kit, I can't remember how much they cost I got them through napa here in town, they still sealed up nice no leaks.
I also beadblasted and painted my valve covers with some high heat paint, painted em a toyota red they turned out pretty good still nice and clean I figured theyd turn to crap but they havent.
So I guess I'd get a set of FelPro's and see how they work for you, they work fine for me, but I had a buddy help me install them and we were careful, you can screw them up very easily.