I just wanted to get some ideas on my set-up

Was looking to get a ASUS RT-N66U to act as my router, take care of DHCP and all that stuff, would also leave the wireless enabled. Then have the Zyxel P870H for ADSL and possible upgrade to VDSL, using it in bridged mode. The rest of the network would include a gigabit switch, Belkin Play Max (AP), Belkin N+ (AP). these are needed to connect all the wired devices and provide extended (back-up) wireless signal.

Devices
Windows 7 PC  x5-9
Mac PC             x1-2
Smartphones    x4-7
Xbox 360          x3

If i was to change to telstra clear, i would just replace the Zyxel and change the ASUS settings?

To minimize downtime for the network devices if i connected the ASUS RT-N66U to a switch first i would be able to restart the router without losing connection between device on network? same with the Zyxel modem?

The set-up would be able to handle a number (2-6) HD streams from the local network?

Both the 2.4Ghz and 5GHz wireless networks would still function if one device was reset?

any suggestion would be helpful, basically trying to put together a robust network as my current set-up needs rebooting every few days, and any changes stop streaming media as the media pc is connected to the router. Only things i would be buying would be the ASUS and Zyxel product

Thanks for any help

(PS any suggestion of where to buy equipment from would be good)