actually the oem head gasket is pretty good, and the oem base gasket is better than most of the others, i would get the cometic base and a oem head, and seals are very easy to change, you just need a good pic to remove them, and put new ones in. no need to tear motor apart, just a few things need taken off to do this. if you have tools do it your self, no need to have a shop do them.  put a little bit of grease on the seals before you put them in.