MROCZNY,
I am in exactly the same situation as you except here in the UK the saving is looking like nearer 50%!
To be honest the driving force for me is the prospect of intensive training and continuity. That's worth a lot of money and time in my flying training experience (with the University Air Squadron, part of the RAF).
But I would also second Brain66, there is no substitute for training in the airspace in which you intend to fly. If you do go to the US you MUST budget for retraining back in Germany/Poland as you will find the airspace and, most especially, the Radio Communications very different from the US.
That's what you've got to balance.