I don't know if you guys are aware of this, but ...
I wanted a Xikar cutter to go with my new Palio from Cigarmony.
Lo and behold, Mark has put up a page answering the very question I had, namely:
What are the differences between the different models of cutters?
Link Here
The page is short, sweet, and to the point, and helped me make a decision.
Thanks, Mark!