Imo for jungling diana I would go straight burst. When i play her I focus on killing the carries. I take a 21/9 mastery page on her with my runes set up Mpen reds, HP yellows(i dont have anything else really), and straight AP blues and quints. This gives you a lot of early game damage that you need to burst people down in ganks. And Items like iceborn gauntlet arent bad, but I would leave them for more tanky junglers like skarner that go more for sustained damage than burst. Also, i do start machete + 5 pots with her, but I leave it at that. Its more personal opinion, but I really dont like the spirit items much. They have good stats and all, but when I build my burst diana, I would benefit more from flat ap/Mpen items like Rabadon's, Void Staff, and maybe a Lich's Bane.