Best Beef track ever?

A pretty complicated list no doubt. These are just a few that come up when I think about them and I guarntee there are probably better ones that I can't think of right now, but out of these which would you guys consider to be the greatest 'beef' track. Ether is up there on my list, along with Tupac's - Hit em up probably tied for second. But honestly, my favorite all-around dis track would be Eminems - Nail in the coffin, just the flow and lyrical assault that Em launches is amazing.