The Blue, Black and Ruthenium are all great choices.
But I will stick with the Grey Ruthenium. Well, " stick ", you got me, IF I had to go for a 5960 ( I am quite tempted, by the way ).
Why the Ruthenium?
Because you can find black and blue dialed Chronos, but not very often ruthenium.
It has, in my opinion, some extra class.
Fascinating, captivating.
Best,
Nicolas