1. I have an AirPort Express that is a few years old but seems to work just fine. I get up to 65 Mb download speed . Will I gain any significant increase by getting an AirPort Extreme? 2. My other consideration is that I have an old WD 500GB portable hard drive for backup. I do have a new iMac with a 1TB Fusion drive. Does it make good sense to maybe get the 2TB Time Capsule? I have read about some issues with them getting hot and I'm not sure that I'll ever use the 1TB on the iMac. Thanks for any thoughts.