Leupold has an excellent warranty and service. Though you didn't say how you were planning on using a new scope, I'd say the extra magnification is worth $50, let alone the W&S.
Any differences in reticles? I suspect their both Std Duplex reticles but sometimes a dealer will stock an alternate reticle to offer a different sight picture.
I'm not sure how easy it is to get the reticle changed on a Nikon.