In reply to alps_p:
My girlfriend and I climbed Huayna Potosi in Bolivia in June 2016. The peak sits at 6,088m and the ascent starts from 4,700m. We'd done a lot of munro bagging beforehand but nothing Alpine and we only really struggled with the altitude. So it might not be ambitious enough for you guys, the only hard day was the summit day where you have an alpine start and then get straight onto the glacier. There's only one section that is a bit scrambly and just requires a walking axe. On the way back you just abseil down.
On the plus side it's only a few hours away from La Paz, which is a relatively easy city to get to and helps with acclimatisation as it sits at 3,640m itself.
We went up with a guide and the details are on this site -
http://www.climbingsouthamerica.com/country/bolivia/activity/climbing-and-m... That page suggests that January might be out of season but it could be worth contacting them.