Ive just been doing some reading and it seems that there is very little useful information on Xp steppings and overclocking.
There just arnt anough chips around to make usefull comparisons.
It certainly dosent seem like there is a killer stepping like the AXIA with XPs.
Id just try to get the newest chip you can, regardless of stepping.
Im happy with getting a week 46 the only other data I could find for my stepping was for XP-1900 chips, so im hoping for a good overclock.
P.S..the Xp-2000 has its own stepping OGOGA (or something like that)