for me - Eastern European girls, no doubt!
of course, there are beauties in every country, but such a great percentage of good looking girls could be find only in Eastern Europe (Ukraine and Russia partialy too). I judge by the common faces in the streets I had seen while travelling, celebrities - for example sportswomen, and btw 90% of my favourite pornstars are european.. only a few (not more than 5) are american. This is not an insult for America or other countries, everybody just got his own concept of beauty and his own taste.