WoW crashes only on one toon.
Try going to :
World of Warcraft/WTF/Account/<<your account>>/<<realm name>>/<<priest toon name>>
and deleting the cache.md5 file.
Also remove the one at
World of Warcraft/WTF/Account/<<your account>>/
You could also try copying the cache.md5 file over from another toon.
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