Do I go for a second Rolex?

[andyol1966]

I currently own a SubC (LN) and I am thinking of getting an Explorer II 42 White face as I love the rugged clean looks and think it will complement my black face Sub.
However as the Sub is my only watch, I am going through those doubts that I'm sure many of you have had when considering going for another watch to your one and only?
Wondering if I may regret having two? I am being greedy? Can I justify it? etc.
Sure some of you can relate to this. I am not really a watch collector, but my heart is drawn to the new polar Exp, but my head is telling me something different.
Any advice would be appreciated.