In reply to zak:
check out andes, small company run from castle douglas in scotland, run by john biggar, who wrote the book (literally) on andean mountaineering. was on one of his trips in the cordillera huayhuash year before last, very well run.
google his name and it will take you to his site.
from what i remember him saying though, huascaran is getting harder to climb because of poor snowfalls, and some years may be impossible by the normal route.
that part of the andes is amazing; and if you have time it is worth a visit to the arequipa area too, totally different to the ranges in the north, high desert and 6000m volcanoes. there is a 5 day trek though the colca canyon (see lonely planet trekking in central andes book) which has to be one of the best treks anywhere in the world; we used a local guiding firm in arequipa, zarate aventuras, though speaking some spanish would be necessary
hope you get something organised, it is a stunning country...
gregor
