The interest in alternative trekking routes to the famous Inca Trail in Cuzco is increasing. Many people are complaining how expensive it is to do this trail; while others are pointing at the excessive commercialization. For those interested in analyzing other posibilities, the english magazine Wanderlust, specialized in non conventional tourism -a little like the old Lonely Planet travel guides- dedicates a brief note to the Choquequirao trek, a path of 4 days, much harder to do than the Inca Trail, and wich also allows to access another inca city in ruins.
Wanderlust says:

Choquequirao’s mountain-top ruins are mercifully free from the hordes that visit Machu Picchu. And tours to this route are already being sold in England. Apparently, Cuzco is already diversifying.

The article can be found here.