you say you're a big chronograph fan and one of the 3 choices you give us is the 5070 ...
Well, if you can get one from your AD, go for it. Imo it's the most beautifull chrono ever made. For my it's even the most beautifull watch ever made
About the 5959. They make only 10 pce per year so I don't think we have a big chance somebody of us 'purists' has one. It is a nice watch but the 33mm is imo stupid. We're not in the 1940's anymore