Todd, I think you are getting
some good responses on this site.
I agree with Richard and Paul. Many IWC's are extremely versatile. Assuming you want to stay with SS, I do think the white/blue 5001 may be the most versatile. The white with gold hands is a bit dressier. In WG, the ardoise dial is a winner, and Bob Bunnik's photos regularly drive me over the edge, as did Richard's photo of his Perpetual. It is also quite versatile.
The VC Portofino is gorgeous and I doubt you would find the 46mm diameter too large. The watch is a good bit thinner than the 5001 and wears comfortably despite its diameter, in part due to the thinness and in part due to lug design.
I think you must have relocated since we last spoke if there are no IWC dealers near you!
For me, if maximum versatility were my goal, I'd choose the white/blue 5001. If sheer beauty were the goal, the Portofino. And if cost was not an issue, the WG ardoise dial. Your mileage may vary.