Why use anything but Luna? It is all things to all people.
My staples are Vector-Cell, DogmaX, and Pantheon.
My new favorite is Solarion.
I used to use Aquarium (frame animations), ToonXP, Sex Pistons (Smart buttons), and the Unorthodox Skinpack (Button placement [Anomoly still holds up in Vista Pretty well, PocketPC is a bloddy mess
]) to show off what WB can do. Now I think I'll roll with Molton and The Magic desktop.