if you want the best price without getting raped up the arse like you will get when you walk into jb,strathfield and so on
go to ebay.com.au!
i got my pioneer 5850mp deck with postage for $270 in jb it is selling for $450 you should go for the the pioneer 6000 series it has blue lights! and looks really good (350-400 ebay) or 600 at jb/car audio place, most decent pionners are ipod compatible but remember you will have to buy an ipod car kit thing, these sell for around $150! (rip off but then again you have an ipod so need i say more)
if i were you i would screw the whole idea of the ipod thing and just use the head deck, ALL PLAY MP3 CD's so who really cares.
if that sounds like a crap idea maybe go for a jvc single din sized dvd player get the screen/monitor later and just use the fact each dvd holds 4.7 gig or around 1000+ mp3's.
when buying off ebay make sure you are buying from someone in australia, they have a good rating and the fm frequencies will work in australia....who cares about am
the smaller headeck is the 6000 series, the second is another type they are both worth just over 400 including postage in my opinion they booth look "fully sick"