Have you looked at the official BMW wheel configurator?
http://www.bmw.com/com/en/owners/acc...mplete_wheels/
It's worth a browse just to see what's on offer from BMW themselves. If you're doing ED in the winter, can you order winters instead of summers? If you are picking-up in the winter in Germany then winters might be better anyway. Here in the UK BMW my Dealer offer tyres 'free' with the wheels and swaps and stores them for me for £30/yr.
it may seem counter-intuitive, but if you get BWW winter wheels and tyres out of the factory, when the time comes to swap, you may find it much easier and have more choice of sources for summers. But as I said, I don't know if you can get winters on a factory order, even with ED.