For a daily user, a XXXX is perfect. There is nothing wrong mechanically with the knife. They are XXXX'ed out for cosmetic purposes only. I have a few, and to be honest, I can't find a flaw on any of them. The ones that don't pass QC for any other reasons go in the big barrel!
The option of having the XXXX knives solves a lot of mental anguish most Kershaw fans have: I want to keep it minty fresh, but I want to use it too!
I don't think you'll find any XXXX S60V's out there, and the SG2's are becoming harder and harder to find. Good luck in your search!