I chose the standard 3" GP a couple months ago...
I could have bought a stainless GP Wiley Clapp, but I decided not to go the extra $150 it would have cost me.
I'm very happy with the GP I ended up with. It is very accurate, even shooting the plates my club has at 80yds posed no problem.
The trigger, both DA and SA is very smooth and easy to use.
I found a set of compact Ruger GP100 grips, which are actually smaller than the WC grip.
As far as the "exclusivity" of the WC edition...Ruger is going to introduce the same revolver in their regular line up, I understand. It won't say Wiley Clapp on it, but it will have the same features.