My new bow

So i found a bow and i was wondering how much it costs.

Short Bow req.8 Marksmanship
Damage +13% (always)
Armor -10 (while attacking)
Sundering 10/10
Armor +6 (vs. elemantal damage)

I really like this bow and im thinkin of replacing the +6 armor grip with a +30hp grip. So if u could tell me how much u think it would be worth with the warding grip and wih the fortitude grip i would greatly appreciate it.

try to get the 10/10 out of it!
thats worth like 30k

~h9`

i know how much the sundering string is worth but i want to keep the bow to use. Im just wondering how much its worth