I couldn't believe I had so many answers!!! They were so much helpful, thanks a lot everyone, really!
For those who said I should buy a cheap prime and "start shooting", I already did that six months ago, since then I am shooting with a 50 1.4, which is a pretty nice lens, I really like it, but I will sell it (because I can sell it used for $400 in Brazil, believe me!) and then I will have about 2K to spend in US.
Right now, I would love to shoot a 35, 85 and 135, I really enjoy shooting with primes; but sometimes when I'm traveling around I feel like there is not too much time for changing lenses, and since "people working" can go from a close portrait to a wide scene very fast, I am thinking about getting a standard zoom (a Canon mkii If I have enough money, or a Tamron if I dont).
About the big whites, as someone said, they are too big and look too expensive to walk around alone, away from big centers and etc, as I like to do. I wouldn't feel comfortable I guess.
I think I'll just have to live with my dilemma, primes or zoom.
Thanks a lot. Hope you are having good news from Brazil, protests have started, people are tired of being fooled by government, we are living a moment of hope in real change. 90.000 on the streets of São Paulo yesterday, It was beautiful.