Some more ideas from the southwest states.
Dark Canyon, Utah
May 22-28
http://www.sierraclub.org/outings/national/brochure/05047A.asp
September 25-October 1
http://www.sierraclub.org/outings/national/brochure/05131A.asp
Rocky Mountains, CO
August 6-14
http://www.sierraclub.org/outings/national/brochure/05121A.asp
Grand Canyon, AZ
September 24-October 1
http://www.sierraclub.org/outings/national/brochure/05132A.asp
Thunder River and Deer Creek in Grand Canyon National Park
October 9-15
http://www.sierraclub.org/outings/national/brochure/05134A.asp

Comments
Dude most of those time are during school. It would make it much easier if they were during the summer. I can't see how I could possibly take the 9 to 11 days necessary for travel and prep time required for some the hikes in the middle of the semester that would be missing at least two classes and maybe upwards of 4 if they are M W F. I won’t know my schedule for at least another couple month from this point anyway.