I've never skimmed a head that in a fast inspection looks ok and never had a problem with it. On the other hand I've never blown a head gasket like that. What you can do first is assure that the cam bearings are still well lined up. There's no point skimming a head if the cam bearings not in line. Unbolt the 8 rockers off. Then remove the timing belt and turn the cam by hand. It should rotate fairly freely and not jam up. If everything's ok, then you can decide if yuo wan't to get it skimmed. It doesn't cost much, but it means a little more work. On the other hand you can use the opportunity and overhaul the head on the same go if you have no idea when that has been done. Checking the exhaust valves is always a good idea at least. Also 3-angle cuts can be done to the valves and seats when the head goes to the machininst anyhow.