Great post Chris.
Givenchy Gentleman is just how you describe - beautifully balanced, certainly with civet, citrus and a big round, smooth, refined patchouli dominating. It reminds me to a small extent of mouchoir de monsieur, and it certainly stands up to that benchmark of quality. I had a chance to do a direct comparison of old and new and they are a little different to me; I would say the older is starker with more civet and somehow flatter in the big patchouli. I am not really a big fan of patchouli so I rarely reach for this but I recommend it highly.
Xeryus I enjoyed two bottles of this way back in the late 80s (I think) but haven't been able to look at it since. Somehow one day, it just seemed too much. I bought a bottle of rouge blind, remembering how much I had enjoyed the original and I think this concoction put the nail in the coffin for me. It was soon gifted to a friend.
I have no experience of the others....