I would prefer a partial wipe, one that while deleting our skills and items, leaves the characters and their histories intact. That way you eliminate anything gained illegally (from a random bug) or lost while still having players keep their characters and well thought out stories. On a similar note I believe that since the current PS year is 750, any characters created after the 1.0 release would be born in 751+. That way you could justify the pre-1.0 characters from new ones, a small little trophy for those who have supported PS.