Hey, i am buyin a car audio system and i was wondering what i should get? My budget is about $1000 to $1500 (i live in australia). I was thinkin of gettin the alpine CDA-9827 head unit, alpine SPS-171A speakers for the front and alpine SPS-690A speakers for the back. Do you think this system would be any good and if not what should i add to this or what other brands and products should i get?