After looking at the different lists on Goyf Sligh, I believe it is best to go with a 16 count creature base. I think everyone will agree that Kird Ape and Tarmogoyf are worth to include. I think the other 2 slots should be Grim Lavamancer and Quirion Dryad. If you really don't like dryad in the deck, then maybe you should test out Burning-Tree Shaman. I know he is a 3 drop, but a 3/4 beater isn't all that bad to have on the table.
I think the creature base is what we seem not to be agreeing on. What do you think about Burning-Tree Shaman?