Any of the goo spilled in the original Evil Dead.
If we're talking most memorable kills, I've always had a soft spot for Friday the 13th Part 2; machete in the face, throat slit upside down, etc.
Is "The Final Chapter" part IV? If so I love the scene where Jason gets it in the head and than his face slides right down the machete. Tom Savini is THE MAN!
While my tastes in Horror films lean more towards sublime & gothic tales. For splatter I'd go with the already mentioned Alien chestburster or the Dawn of the Dead headshaver scenes. Most other pure splatter films do nothing for me so my exposure is rather limited.