500 ironite worth 2 oracle talisman ?

[Liu]

I'm currently lacking 2 talismans to complete a second set. However I'm wondering if it's worth it to buy 2 additional for 500 ironite, which is quite a hefty price tag considering that destiny not only requires 2 talisman less for it's bonus, but also strikes me as more powerful in terms of survivability as heal is applied AFTER damage taken while damage reduction is applied WHILE taking damage (and additionally can be countered by crave etc). I wouldn't even know in which character to put it on, as most 3 slot blues toons aren't high hp or go by the name aset and cause funny bugs. So ... in your opinion: are 500 ironite worth 2 oracle talisman ?