I will pledge $20/book.

As for suggestions:

Shadow Speaker, assuming you haven't read it yet (I suggested it for the first try).

The Witches of Karres, which chomiji suggested then and I happen to know you have a copy of.

Redemption in Indigo, assuming you haven't read that yet either. It's interesting and short.

I guarantee all of these are better than Walpurgis III, although they may not make for better posts. :)