I can't say it enough to anyone, see Cannibal Holocaust. This movie takes so much shit, but as I breathe I personally think it's a piece of post-modern genius. Way ahead of its time. The second (or really the first, imo) cannibal film everyone should see is the already mentioned Jungle Holocaust. It plays so much like an action/adventure film that it's probably the most "mainstream" cannibal flick, but it doesn't sacrifice its nastiness. Of course Ferox completes the the triple feature.

Man from Deep River I don't take as much of a cannibal film. I see the direction, but it's way more of a jungle adventure, and a lot closer to A Man Called Horse than a cannibal flick. That said, it is a great fucking movie, just not in the same lot.