Delta.
Brasilia is easy- just buy a ticket on TAM!
Sao Paulo is definitley worth it- Delta flies there 2 times a day. The further south you go, tho hotter the women. If you can get to Curitiba, Florinopolis or Porto Alegre, you'll do quite well.
Atlas/Polar will fly you into VCP- 50 miles out of Sao Paulo. Very easy to jumpseat.