I've found that the more zombie films I watch the more I zombie game and the more I zombie game the more zombie films I watch!

Hell is a really good German post apoc / cannibals film albeit it lacks zombies
Extinction: The G.M.O. Chronicles is a German zombie movie that IIRC ends in a castle and also considers the effect on nuclear reactors of an absence of power for cooling (something most post apoc movies/games - even my own! - tend to overlook)
There are a few more winter ones listed on one of my project pages
http://sss.miniaturemojo.co.uk/index_mood.htmI do find that the European movies tend to make me think more: maybe it's because I have to read the sub titles.......