We use a system here called "Mixed Member Proportional"
Video:
https://www.youtube.com/watch?v=QT0I-sdoSXUIt means we get two votes. One for the party representative for the residential area we live in, and another for the party we want in Government.
Generally, I vote pretty left wing. I voted for the Green Party representative, and gave the Green Party my party vote.
Hwoever, New Zealand is generally run by two centrist parties:
National Party
Centre Right
Currently in its 3rd 3-year term in Government, elected in September last year.
Labour party
Centre Left
Last ran for 3 3-year terms. Was voted out back in 2008.
Usually there is some form of coalition between parties in Government. I generally support the Labour party, if I have to pick between National and Labour.