Logos already has some ethics books, but I'm not familiar with any of them and don't know whether they are worth the money or not.
However, I think these would be good titles to add (from various perspectives):
- Kingdom Ethics by Stassen & Gushee
- Evangelical Ethics by J.J. Davis
- Theonomy in Christian Ethics by Bahnsen
- Theonomy, A Reformed Critique ed. Barker, William S. and W. Robert Godfrey
- Five Views on Law and Gospel ed. Gundry (it would be nice to see a lot of the "Five Views" and "Four Views" books: predestination, foreknowledge, apologetics, etc.)
- Christ & Culture Revisited by Carson