I received a brand spanking new digital rebel for Christmas, much to my surprise! My first canon af camera (I'm a nikon kinda guy for the most part) and I love it! However, I'm wondering what third party flashes will work with this one? My friend has a canon 430EZ that we tried with the camera and the digital rebel never acknowleged that there was a flash on it in A TTL mode. I tried using an old vivitar 2500 flash im manual mode and for the most part it worked okay. However, I'd like to use a flash in ttl mode with guy. Any ideas?