For almost the last year I have been using an Airport Extreme on 2.4b/g and and Airport express in my room to extend my wireless network. I also have a usb hdd configured to back up my macbook using time machine. Well I have a new roommate moving in and he has his own extreme and two expresses. I have some questions on what would be the best way to consolidate our networking devices. I considered us selling our extremes and getting the new time capsule so both of our macs can use 5ghz while my girlfriends dell uses the 2.4. Is there a noticeable speed difference between time capsule backup vs hard drive to extreme connected via usb? I think i want the expresses to extend the network. Im just not sure what the best set up would be. Any advice? Tips? Comments? Thanks in advance. much appreciated.