Check out this ladies site: http://www.angelfire.com/freak2/kris...tpounding.html
She has hiked all 900+ miles of the GSMNP and has chronicled her experiences on her site. It's a good crossreference for backcountry fishing when considering what trails to take, how dificult they are and what kind of condition they were in when she hiked them.
Here is the the list of known 900 milers: http://members.aol.com/gs900miler/members.htm
Another challenge you might enjoy is the SB6K: http://www.carolinamtnclub.com/SB6K/SB6K%20Index.html