One of popular exchanges -
https://bitcoin-24.com - had their money that they stored in a polish bank seized by authorities, so I would be careful with saying that Poland is a "bitcoin friendly jurisdiction". It's only as friendly as the authorities don't know what you are doing, but if they notice you, you can easily fall into trouble.
I would suggest that you check possibilities for setting up your business in Germany, as they recently recognized Bitcoin officially, and there are some successful businesses that are operating from there.