Hi!
I suggest that you check out these two threads that mention what to expect on the 601 layover.
http://www.flyertalk.com/forum/lan-l...we-expect.html
http://www.flyertalk.com/forum/lan-l...-over-lim.html
As to arriving in SCL, the reciprocity tax/fee is only for passengers with US/AU/CA/MX passports.
It's now $160 for US passports and it's valid for the life of the passport. You can pay with USD or credit card. (
relevant thread)
Have a nice trip!