PC on almost perfect storm bow

I need a price check on the following:

Sundering Storm Bow of Fortitude

Damage: 15-28 (Req. 10)
Damage +15%
Armor -10 (while attacking)
Health +30
Armor Penetration +20% (Chance: 20%)

Thank you in advance

20-30k to those who dont mind -10

15-25k imo...