I am also looking to climb Aconcagua in Feb 2005. I am planning to fly Beunos Aires on Feb 8th. Can climb at any time but need to aclimatise fully.
I have done Mont Blanc, Haute route and winter mountaineering in Scotland, spent summer in Itlay trekking and climbing. I am now in Thailand and have just finshed some cycling so fairly fit. Will be going to scotland to do winter mountaineering in Jan and complete winter mountain leader training course.
I think that Aconcagua is relatively staight forward and I am 31 years old and pretty easy to get on with.