Regarding money in your bank account, this is not something which is fixed by them. Different cities in poland have different requirements. I am not sure about how much you should show but usually it works this way for example 300zl for house + 450zl for living approx = 750zl for 1 month, so if you show something like 10,000zl or more in your bank account can be enough. At times i have heard students showing 4-5000zl and also getting karta pobytu, so it depends. I guess in your case you alread have 1 year visa so they wouldnt think too much to give you karta pobytu but again i am not specialist and more money is better :) The address is
Department of Foreigners
ul. Długa 5, 00-263 Warszawa
Mon 10:00 a.m.-6:00 p.m., Tue-Fri 8:00 a.m.-4:00 p.m.
For customers: Mon 10:00 a.m.-5:30 p.m. Tue-Fri 8:00 a.m.-3:00 p.m.
You can collect it anytime after this as long as you do the above steps
I have collected mine karta pobytu 3rd time last month and they never asked me to bring zmaldawania. Decision letter doesnt show the time when you can come and collect it usually is in 2-3 weeks. You have to contact them by phone or personally to check if they have got the card ready as this card comes from warsaw.If the card is ready you can pay 50zl to there account and show them the reciept and collect it :)
To apply for new karta pobytu one has to apply 45 days before the current one expires. I have a question if I am abroad and dont reach before 45 days to apply for the new one can i apply through post from my country in my embassy? or can I apply through the post and send the documents by post to immigration office in Poland? Or can I ask my friend to submit my documents on my behalf? As I am planning to be in poland 30days before the current expires so I would be late. Please suggest me something if someone was in similar situation. thanks.