Best broker for emerging markets?

I'm planning a campaign against the Brazilian real, Argentinean peso, and the Chilean peso. Anybody know the best broker to trade emerging markets with, or even if those are offered to trade by any brokers? I know the spreads will be large, but I'll use small lots and probably hold the trades for weeks or months.

I am trying to get the same information but I haven't been able to do so. If someone can help with this issue would be great.
Thanks