Where are the top riders not at the TDU?. Maybe at the Tour de San Luis.
Tour de San Luis 2016 - Argentina Jan 18 to 24. Stage 1 is a short TTT. Stage 2 is a sprint stage. Stage 3 looks like a punchy stage with a climb and then a fast descent to the line, I'm not sure how selective that last climb or how twisty the descent will be. Stage 4 is a MTF, the final climb is about 730 m vertical in 9.6 km. Stage 5 is lumpy with an uphill finish. Stage 6 is another MTF, 1310 m vertical in 17.4 km. Stage 7 is a sprint stage in San Luis.
I've read about this race, but have never watched it, because AFAIK it's never been available on TV for Norte Americanos. But this year, I think the stages will be streamed live on Youtube. That's if Google Translate is not leading me astray.
Not sure there is a complete start list, but confirmed riders include Nibali, Quintana, Sagan, Gavira, Viviani, Talansky, Majka.
Tour de San Luis 2016 preview - Cycling Weekly
I'm looking forward to seeing the countryside, as well as the race. I've never been to South America.