Hi guys,
I discovered this web site a year ago. It really helped me for my travel in Cordillera Blance last summer.
http://www.allthemountains.com/
click on any maps on the left (northern-central-eastern...)
click on any major peaks map (Champara-Huandoy-Huascaran...)
click on Go to base map (on the top on the map)
This is it guys. I just wanted to share that info.
Good luck for Spers in Peru this summer!