Hi there
Firstly 160 gbt per month??????? what the heck are you doing? Downloading HD films perhaps. We are a family of 6 with three teenagers. We are on the Internet , Skype, etc constantly and the kids especially use You-Tube and Internet TV channels and we never come close to a quarter of that figure.
Anyway depending on where the soruce of what you are downloading (I'm assuming you aren't uploading) the speeds will be low due to the number of hops and distance, so your downloads will take longer.
However I do have good news for you. ISP's like Slingshot zero rate (against the data limit) a lot of TV content like i-Sky and offer zero rated periods of the night for downloading content like films. All you have to do is set your PC up to download your stuff between 1am and 7am and you're sorted.
As for WiFi. There are many cafes in Wellington at elats that offer either free wifi with an excellent coffee or you can buy Cafenet service. Other places with free wifi include the airport and the airport bus (you can even pick this up if you drive behind it
) There are proposlas for wifi hotspots along the waterfront in Wellington, and I guess that during the rugby world cup there will be many more starting. Otehrwsie wifi is available from Vodafone or Telecom.
All in all it's no where near as bad as people make out.
BTW I moved from Telecom to Slingshot in December. Not only are the speeds faster (full 10mbt down, 1 mbt up) but somehow our data useage has drop hugely. It could be the numebr of zero rated sites but it isn't the overnight free allowance becuase they give you a measure of that and it's only about 3% of our overall usage.