Hmm I disagree with not doing the head gasket. If you can afford to do it and do it properly then why not? I know it's not a serviceable item but it will only go eventually and since you may be changing other stuff at the same time you may as well give it a shot and do it at the same time. Plus if you wait till it goes you may damage the head and need a skim. Ive changed the head gasket twice on mine once at 100k and once around 50k both for peace of mind and both times I didn't have the head skimmed because the head was always Okay. If you leave it too long and it over heats and warps then you may wish you'd done it when the water pump and belt was off etc. I did mine with new cam seal, rocker gasket, plugs, valve stem oil seals, Oil filter, air filter, water pump, timing belt, oil, coolant, dizzy cap, rotor arm, leads and head bolts. Maybe other things too. I think it depends on what kind of person you are, I'm quite obsessive and will always think 'well that's off I'll change that...then that...and that' Some people are more 'if it ain't broken....'
Each to their own but my view is, if you can afford it, have time, ability and want to ensure further miles until the next strip down, go for it.