Patagonia is massively on my list for travelling next year! They speak Welsh there, dontcha know?! Bloody expensive to get there though...
Fly to Buenos Aires and get a bus down there, takes a day or two but the coaches are brilliantly comfortable and the scenery is awesome. Stop at Peninsula Valdes on the way for some great nature watching.
I didn't go as far down as the glaciers when I was there, really regret that now.
Don't think flights to Bs As are too expensive.