I went down the voip road and find it quite good and i have no intention of getting a land line.
I bought a vertek router for $600 and an 2Talk account for $15 (500 minutes)a month and a naked DSL 10GB connection with Snap for $70 a month. The info I had received was that router supplied by ISP were not very good. I use phone, fax machine, 2 computers, Internet radio and iPhone through the router and found it smooth running.
this is the speed i get.
I would recommend a naked DSL connection over a land line from my experience in central Chch.
David