Mana VS Wis

[Broor]

Hey Guys,
On Blue, I prioritized Wisdom over all else on my Druid, and it cost me big bucks (but I was happy). On Green, I'm suddenly wondering if mana is the way to go in certain slots instead? Using cloaks as an example, the Mammoth Hide Cloak is AC 7 WIS 4 for 1500p, and I just picked up an Onyx Drakescale Cloak for 500p today, at AC 8 MANA 35. Isn't the Onyx cloak almost 100% better? Next example, Ivory Bracelet vs Runed Mithril Bracer; MANA 20 for 25p vs WIS 5 for 1000p (I know the AC and STR makes the mithril wildly better, but look at that price difference). My Druid is 43, I estimate I'm getting 4-5 mana per wisdom point? Other example: Hollowed Bone vs Platinum Armband? Let me know if I'm totally off base, but I feel like I'm saving a ton of plat gearing my toon this way. Drawbacks may just be tradeskill up rate?
Eager to hear your thoughts, thanks for reading-
Broor