Saw an article this morning about a nifty nuke+fallout map that a university professor has developed and shows to all his students. I can't find the article now, however, remember the interactive map is based on a calculation method and modeling that the UK used to use in the last years of the cold war.
The map is available at
http://nuclearsecrecy.com/nukemap/
(you can choose which city to nuke, nuke size, ground burst or air burst etc)
Back to the article NR mentioned - I think New Zealand would be the only viable country of those ten the author provided. The island nations would be too small to host many outsiders (not to mention disappearing underwater through climate change
), while places like Switzerland are at as much risk as any other European country. While NZ would face nuclear fallout from possible strikes on Aus, I reckon it would be the only country isolated enough and able to accommodate a lot of people (not to mention being fairly food-secure).