I saw in your FAQ on kickstarter that you do not have resources to create full voice, and that you do not want to have the same voices for different NPC's and henchmen.
Voice adds a whole new feeling to the game, it gives the characters more personality
How about involving the community?
I know that we all have various grade of audio equipment, but with proper instructions, and sending in some samples, you could get thousands of voices.
With proper processing/Filtering etc, you could clean it up to a proper level.
I mean it is not that many lines of dialog for each NPC, so you could have for example 10 people reading in the dialog, and choose the best of them?
You could even make a web tool who would invite people to record online, then have peer review of it, and up/down voting the recordings.