My expereicne is not with NTL, my BB is wireless, but with regards the hardware, I went for the lynksys wireless router/ata solution. Simple reasons really, 2 devices built into one, youe get 2 ata points, which means you can add another line if you want, and the router/ata combination in one box allows you to set QOS and prioritise your voice traffic over data, which is a handy feature.
You may be able to do the same wiht other devices or combinations, but thats just my humble non IT answer.
Wexfordman