Vacheron Constantin is one of my favorite watch companies. I have the Overseas in blue (4500V) and the Traditionelle in platinum (82172).
They are both outstanding watches that are easy to wear. Every piece posted is fantastic, so I would focus on what you would like to wear and how it would complement your other watches. This is a great way to narrow the field.
The Harmony chronograph is a very cool watch. I think it is widely overlooked and worthy of consideration. The CdV and 1921 are modern VC classics. I also have a soft spot for the Fifty Six day date in rose gold.