I just purchased Apple's Time Capsule. (Hope it will give me more stable and faster speeds). Currently I am using Motorola Surfboard SBG 6580 combo modem/router. I will be taking it out since it is not needed with Time Capsule, but I still need a modem. What modem has sufficient power/speed for Time Capsule? IS IT POSSIBLE TO USE MY CURRENT ROUTER/MODEM ONLY AS MODEM WITH TIME CAPSULE? HOW WOULD I DO THAT? WILL IT AFFECT THE PERFORMACE SPEED? Thanks!