Originally Posted By: julf
OK, will have to look at US prices of unlocked 5S's.

Make sure you factor in this: https://www.apple.com/iphone/LTE/

There are multiple models of the iPhone to support various LTE bands. Buying an unlocked US model (A1533) would mean no LTE support anywhere in Europe. Model A1457 has support for LTE across most of the continent there.