Now still early to say. But here's an advice if you don't like transits, fly straight though it might be really costly. SIA = RM5k return based on experience.

If not, you can take AAX to Australia, Jetstar, Air NZ will provide some other cheaper rates for you to fly to NZ. There are actually flights like Jetstar from KL but then, the transit time. Hohoho.

When are you going? SIA having promos for KrisFlyer. RM3.4k +/- for CHC flights. Return. Cheaper flight? After transit take Jetstar. It's been confirmed that you don't need a Visa if you are going to transit in Australia. Details here http://www.immi.gov.au/visitors/transit/no-visa.htm

As for the RM15k budget, well, basically it'll be enough for 1 person depending on how you are going to use it. 2 weeks. Let's say you'll be using approximately 2 days for flight which leaves you around 12 days there. 1 person, it'll be more or less enough if you are going to do the backpacking style. 

Yes it does show, but it doesn't say what vehicle class you are in. The translation letter will list out everything if the police officer requires further information.