I completely disagree.
You've said you're planning on extending your 4 month trip by a few months, and if I was spending 7 months in South America, I'd want to go pretty much everywhere, see bits of everything, and get a feel for all the different cultures, climates, etc. Then you'll know where you want to go back to and spend more time in next time you're there!
I posted this route idea a couple of months ago, and as you can see, it takes in a LOT of the continent. Obviously it's true that you will be spending a lot of time on buses, but so what? They're cheap, often run overnight which saves you a night in a hotel/hostel, and they're comfortable. You'll also meet other backpackers on them. Some of my best nights in South America were, randomly, spent on coaches!
"Hey,
Firstly, despite what some people will tell you, 6 months is enough to do this. Granted you won't be seeing everywhere as 'in depth' as you would if you had a year, but it's totally do-able.
I personally wouldn't start in Argentina though. I'd fly into Quito (well, Bogota actually, but you've said you're unsure about Colombia) and work down.
Then my route would go something along the lines of:
Quito - Banos - Puyo - Riobamba - Canoa - Guayaquil Galapagos Guayaquil
Guayaquil - Lima (some people will say to head to Iquitos, which is your choice, but I'm happy enough doing my jungle stuff in Bolivia).
Lima - Nazca (Nazca lines) - Cusco (Inca Trail). See this guide.
Cusco - La Paz. See Bolivia Guide for route details.
Once at Lake Titicaca, head out of Puno to Arequipa, and then on to Chile.
Arequipa - Antacama Desert (Just pick a town)
Desert - Santiago - Conception - Puerto Natales (Extreme South), for the Torres Del Paine National Park.
Puerto Natales - El Carafate, for the Argentinian glaciers.
From there, probably up to Bariloche, then Santa Rosa and Buenos Aires. From here, get the ferry over to Uruguay (Colonia and Montevideo) and then head out up to Foz D'Iguazu to see the falls.
Hey presto, you're in Brazil.
Simple as that! "
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