I just bought a new Time Capsule and an Airport Extreme. Both are the newfangled dual-band type. At the moment the AEX is the main base station, connected to my DSL modem in the Living Room. The TC extends the AEX network and is in my office. The instructions suggest the TC should not be a network client and rather be the main base station, and to make the AEX extend the network. How much difference will there be in Time Machine performance between the two topologies? I would really prefer having the TC in my office, so I can attach via gigabit ethernet to the TC when I'm working there with my MBP. I cannot move the DSL modem to my office since I don't have a phone line there (it's really an upstairs bedroom).