Setting aside the issue of the internal hard drive (I can provide my own), is there any difference in the functionality of TC vs AE with regard to 1. Wireless networking of computers, drives and printers 2. Ability to use Time Machine or other back-up software via airport 3. Wired networking 4. Other benefit over the other (firewall, speed, range, reliability)? I'm about to buy one or the other and see the extra drive in the TC as a plus for the money but hope I'm not missing some key difference that might make AE a better choice. TIA for the help.