what the watch, will be used for.
I am probaly biased for 2 reasons;
1) I already have a 5146G
2) I'm not a fan of the Nautilus range.
For me the 5146 has complications that I use everyday.
It sits just right on my wrist and all the dials are easy to read.
Also I like it that the watch has both luminous hands and markers.
The only thing that I would like to see added is to have a 24hr (am/pm indicator) incorporated in the moonphase, like the 5135
Good luck in your decision making and most of all enjoy the experience.