Which of the following items should I buy for my guitar?

The DiMarzio X2N pickup , Lace Deathbucker pickup , or new locking schaller tuners? Iwant to get the most potent distortion possible and i find that feasable in a new pickup. But I also need better tuners because my factory die cast tuners get out of tune very easily. Btw I like death metal just to clarify why I chose those pickups and to hear what you think is best for death metal.