Skip Warrior Enchant, go Tiamat
Lately, I've been skipping the Warrior enchant on most AD junglers, and going for Tiamat instead, because it's only 500 more gold than Warrior, helps clear camps/ waves significantly faster, and gives you a nice item pivot point to dump your jungle item for a stronger 6 item full build. The disadvantages (small as they are) are that you use up 2 item spaces, and have to spend an extra 500 gold (although I argue the benefits far outweigh the costs).
Meta junglers that synergize really well with Tiamat - J4, Vi, Rek'Sai, Lee, Kha... the list goes on.
