Currently I'm using sky's 40Mb fibre VDSL connection and it uses two devices; the first one is a modem I think and that connects by ethernet to the Sagem router which my devices connect to. However the router very disappointing does not support 802.11n, so I was wondering if it was possible to use another router with it? (I know my pppoe login credentials). Or even better a device that could replace both devices, because atm I have 4 networking boxes when you include the 2 gigabit switches. Any suggestions would be greatly appreciated guys. 
