>>15 I will go there get some job and then travel around in my free time, and will report back! But I think there is a lot of migration within the country... so cities will have people with mixed pronunciation while I may never really explore the countryside properly...

>>16 I heard the same but also that Florianopolis is just too kommerz and touristy.

I guess I overlooked the most important aspect: availability of jobs. Who would employ a foreigner with bad Portuguese? So either I would need to work in business as a Russian-Portuguese interpreter or of not I don't really know! :( In this regard Sao Paulo seems the best option because of IT industry...