I have the 500GB Time Capsule, which I am using as a NAS and Wireless access point (I have a BeBox which does the routing and ADSL connection).

The TC was easy to set up as a WPA - took about 5 minutes and most of that was installing the new firmware.

The one downside I found? I have a Xbox 360 wireless adapter, and this is not compatible with any Apple router using WEP, WPA or WPA2 security.

(Before anyone gets any ideas, I enabled security on the router and connected it via Ethernet).