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.

When you say "pic" do you mean picture? No need to tear the motor apart to replace all the seals and gaskets for the top and bottom end?  Please explain.