Damn! Must have the Speedmaster Mark II, and I'll have to say, Tag really impresses me these days. Would do the CH 80, no question. And 80hr power reserve gets my attention. Nothing I own holds a candle to numbers like that! And the white gold GMT Master... Love it! Can't afford it, but love it! I do also agree it's an extremely tasteful 40k piece.
I've been partial to Tags since the kid on my floor showed me his freshman year. I have an uncanny memory and can remember them priced at $300ish in the Sunday discount store advertisements in the 80's. Tags: good watches or what? Also, low-end Maurice Lacroix worth fixing or not (picture tonight)?