As people have already said, 100k is heaps. You'll do really well here, depending on where you are living.

Weather is pretty good here, I don't imagine it would get colder than Canada. Can be crazy changeable though.

For me the best parts of Auckland are the West Coast beaches, really feels like the edge of the world out there.

Jafa is a term that probably means more to rural people than to anyone else, no one in Auckland gives a shit.

A couple of things you should know though:

1) The traffic is appalling, to best enjoy living here you are going to want to get a place close to work or at least close to good public transport. I can't stress this enough, it's balls out here.

2) Auckland city centre is...weird. There is no one central space where everything is, there are some cool centres (waterfront and k road) but you'd probably want to catch a bus to get between them. Shitty city planning, which doesn't ruin the experience if you expect it.

3) If you are into anything that's alternative (shows, bands etc) then you are going to find it hard to wander around into some bars and get surprised by a good show. You'll need to get plugged in to the local scene, once you do I'd say you'll enjoy it because the alternative music scene especially is really good. Posting here would probably be the best bet.

4) If you only stay in Auckland, you are kind of missing the point of New Zealand. You HAVE to go up North, and down to Queenstown. Auckland/Wellington are the best urban centres but the charm of the country is displayed by the scenery and the people in the smaller towns.