I thought I'd just update you all on my choices and how its worked out so far.
I decided to go with Telecom for the phone line as it just seemed to be the simplest solution. Signed up over the web and it all went very smoothly. I gave them about a week's notice and the phone was enabled ready for me to move in. So far so good.
Based on The Hodges recommendation I went with Xnet for broadband, because they don't insist on a long term contract. I picked up an ADSL modem on TradeMe for $26 and signed up with Xnet via their website. They needed a prompting phonecall to get things going but they basically got the ADSL enabled in 24 hours. It's working fine so far. I'll run a speedtest later but it seems quick enough.
So all in all it has worked smoothly so far. Thanks to all for your advice.
Martin