I caught the Bally bug in a hard way. My two favorites are Flash Gordon and Medusa. I just finished restoring Flash Gordon and I'm in the process of restoring medusa. I was first drawn to both because of the playfield artwork. No concidence because both were done by Kevin O'Connor. They are colorful, elegant and truly tell a story without words. The upper area of medusa feels like you're in Zeus's court. Both are delightfully simple yet very challenging.