In reply to climbofalifetime:
At that time, you may hit the south American wet season, so should choose your objectives accordingly.
For Bolivia and Peru, there may be a lot of soft, fresh snow and dodgy avalanche conditions. The white stuff tends to be better later in the year.
In the past, I have found it worth speaking to Andean Summits in Bolivia.
They are open to out-of-season adventures, and can advise on good options.
There are some good rock climbing destinations in the Cordillera Quisma Cruz, and rock climbing options round the central desert (no wet season there).
http://www.andeansummits.com/Bolivia/Index.htm