You might want to read through this guy's blog: http://elwever.blog.com/

He used to be a member of my local mountain biking club, but he moved to Asheville about a year or so ago. He's been posting lots of cool stories and photos of the trails he's been riding down there. He must have an email address posted somewhere, or maybe you could leave a comment on his blog and see if he has any suggestions for you. I've never met him, but he seems like a nice guy.