I guess you have seen Shaun of the Dead? Same crew as Hot Fuzz but with zombies and MUCH funnier. Quite possibly the funniest film I have seen.
I am not into horror/zombie stuff, but enjoyed "28 days later" which is of that genre. Very like I am Legend, but darker and more substantial.
Dog Soldiers is more knock about horror, but I enjoyed it - squaddies vs werewolves.
I guess you have seen Aliens and the Terminator? Possibly the best sci-fi films ever. (Don't believe the hype about others in their series being better.) They both have a bit of a dark "end of the world" kind of survival horror feel, although they are more properly action films.
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