Hey Adam make the most of your week here..its really a too short a time to see everything so pick and choose where you want to go.
I strongly recommend Milford Sound for a day trip and when in Queenstown make sure you take the gondola up to the skyline, enjoy the luge (its massive amounts of fun) and also the best views.
October is a great time to be here as snow will still be on the tops but the weather will be warming up nicely.
Canon 550D, Canon EFS 17-85 IS USM, Canon EF 75-300 IS USM, Canon EFS 10-22mm USM, Canon EF35mm F2.
Got some of the gear but really still no idea...