You can use any router that is compatable with a PPPoE connection Amougst nanes to can use as the user name is your BTInfinity email addy as well as others.
Although there is no password required some routers will not accept this so just put a space or use anything.
That seems a rather expensive device, unless you have wireless devices that support the new standards.
Here is another list.
The TP-Link TL-WR1043ND is popular, and much cheaper, and is in use by many people on this forum.