Shadow: Existing RGB cable? It doesn\'t come with an RGB cable. It comes with 3 rca cables, but one is video and 2 are audio. Your adapter would require you to have an RGB cable for that to work. It wouldn\'t be any better than just getting the S-Video cables to begin with.
AK: S-Video is just video, hence the name. You still need to use the two rca cables or buy optical cable for audio.
Phoenix: Monster is a brand name of regular old cables. They are a little bit better than normal ones, but much more expensive. They make S-Video cables, RGB, etc...