Shaun of the Dead and Zombieland, definitely.
Not seen Dead Snow, but almost bought it, but picked up 'Let the Right One In' instead, I know it's a Vampire film (and this thread is about zombies), but it's a fantastic film and I highly recommend it. I've only watched the Swedish original so I don't know what the American remake is like. (To be honest, I prefer watching originals over remakes)
I didn't mind [REC], it was a good film, but I don't think it was anything special for me.
Resident Evil films are entertaining for me, but they're just raw action for me - don't care much about the plot, the zombie elements, just to watch people kick-ass in ways that are physically impossible. The latest I watched at the cinema in 3D and felt they slowed half the movie to just say, "3D? **** yeah!" But it was still a good film. If the protagonists in the games were as badass as Alice, you could finish each within 10 minutes.