Some soft corals would be an easy way to get started. Lots of people like Sarcophyton and Actinodiscus, and Sinularia are also easy to keep. Your setup sounds pretty flexible to me. Higher-light animals might not do well at the bottom, but the top should be fine for a wide variety of animals.
A local reef club would be a good way to get started on getting animals, and advice on where to find them. There are also a lot of reviews of online vendors here at RC.
This book is also very useful, IMO:
[ericsbook]