PC on inscribable Dead Bow req9 15^50

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Dead Bow req9 Inscription 15^50, lets say I'd mod it with 20/20 and +30, what would it be worth?

By the way, I'm not a native english speaker, can you tell me what is correct: "Inscribable" or "Inscriptable"?

I just paid 25k for a Req9 20/20 15^50 +30 Dead Bow (Tyrian) but I can't imagine there being too much difference, so perhaps 40k? Thats my best guess anyway.

As for the two words I think both are actually correct although the latter is spelt "Inscriptible"; personally I use "Inscribable".