I followed your first project on and off and wished I'd taken part. So, I'm not going to pass up this opportunity. As long as you don't mind a pompous English twit in your recordings, I'd like to join in an active role.
If you are taking suggestions for other ideas, (yes, one thing at a time, and all), I always thought that The Council of Elrond would be a good one. Nice and long, plenty of lines for everyone, and a good, juicy, background devolopping scene.
I must ask, though, for these recordings, will you be wanting sound effects?