Treking Southern Chile in July

We will be in Bariloche in July 2009, I am sure we will be tired of skiing after this week. We as a family would like to do some cold weather treking or maybe something else. Puerto Natales seems to be the area. We do understand it will be winter. I am open to suggestions also. We are in good shape and are not afraid of a strenious trek, please give me a little advise.

Torres Del Paine is the best place to go but not sure what its like in winter time
http://www.interpatagonia.com/puertonatales/index_i.html

I spent 7 days hiking and camping and its amazing.

Also look at El Bolson and El Chalten in Argentina