With the Q50/S70 and NevoConnect - range depends on the environment that its it.
I've seen 50ft to 90ft depending on what building materials are being used in the house and where the main nevoconnect is placed in the house. Currently, the Nevo will use any other Z-Wave devices as repeaters only and this can also be achieved by adding another NevoConnect which is $299 MRSP USD. Approx $350 in Canada.

The S70 adds Wifi but it is not intended for equipment control - rather Media Management and the new built in Web Browser for viewing website optomized for Mobile Devices ie. Blackberrys, Palms, iPhone etc. This will allow the client to view IP Cameras, check traffic reports, weather right from the remote.