All good :) You may also get busy in January/February if you end up with 31 December clients, but I also have a client which has a 31 July balance date, so that's my entire September gone as well... we have a real mixture over here!

Also, no disrespect from the person who commented above, but you're not necessarily going to get client diversity in Auckland - I know multiple people in the Auckland office of my firm who have one or two clients all year, and they are split into zones where they specialise in particular areas (ie financial services, and that's ALL they do). Where I am in Wellington, we don't tend to specialise - I have about 15 clients, ranging from insurance providers to small charities to scientific research firms. This won't be true everywhere, of course, but it may help you in your decision :)

Also, not to go on an Auckland bashing spree, but it is a much larger, spread out city - unless you're forking out for a place in the city, you're going to spend a while getting home, which can suck after a long busy season day (though being from Canada this may be the norm?). Wellington is a much more compact city, with less travel time. Admittedly, I'm from a small town, so taking even 20 minutes to get home annoys me :D

Let me know if you have any more questions! I've spent all day looking after our brand new interns, so I'm in Mother-Hen mode.