I know its expensive, but just remember its nz currency and everything is a bit more expensive, i also don't mind paying an extra couple of hundred for the prebuilt because i don't want to take the risk to build my own (and ill also have a warranty).
http://www.pcforce.co.nz/i5-4670k-gtx670-16gb-ram-2tb-ssd-hiend-gaming-p-2356.html
http://www.pcforce.co.nz/i5-4670k-gtx670-16gb-ram-2tb-ssd-hiend-gaming-p-2356.html