I love the Art Loeb trail; a friend of mine and I yo-yo'd it MLK day weekend earlier this year and loved it. Should be beautiful in September as well (and a bit less cold). There's also lots of wonderful camping and day hikes in that area off the Blue Ridge parkway (my favorite camping spot is one in Graveyard Fields - blueberry and blackberry bushes galore). Additionally, there's some nice little loops in Shining Rock Wilderness (in which half the Art Loeb resides). www.hikewnc.info has maps and descriptions for lots of good hikes in the area; I plan on frequenting it over the next couple of months myself.
The section of the AT in the Smokies is also lovely, you really should check it out if you haven't before. In March I hiked a nice little loop from Newfound Gap along the AT to the north end of the park and then back around the north-northeast border of the park back through the Mt. LeConte area.
edit: Newfound Gap, not Newfoundland Gap...