Just to clear some things up:
1/ Even if you get mods engineered you can still be defected for them. An engineers certificate does not guarantee you can't be defected, it simply makes it much easier to have the defect cleared.

2/ For factory HID's to be deemed legal they need to meet certain requirements in Australia, typically they need to comply to Australian Design Rules pointing specifically at lighting. HID's to be factory fitted must have: Self levelling system, properly designed projector housings with a maximum cut-off height, lens washer system (which is why you see factory HID cars have those ugly little jets on the bumper).

3/ Whatever you do, you do it at your risk. However, in regards to HID's you also do it at the risk of other drivers as you will most likely blind oncoming traffic at one point or another. We can advise you of places to get them fitted, but some of us like to make sure that you know it's illegal and potentially very dangerous.