My first AU question: Stereo related

[dansedgli]

Hey guys, Im happy to say Ive got an AU now and an awesome one at that!

What have you guys done with your sound systems? The XR just has a factory system with the double din Head unit including a cassette deck, it has a stacker in the boot.

Can these be replaced without too much trouble? Are they worth replacing with something nicer?

Whats the deal with the steering wheel buttons? Can they be used on other systems?

I was thinking about putting my other head unit in with a pocket for now and later on fitting an in dash screen below the head unit.

What can be done with the speakers? They are funny shaped in the AU arent they? 4 by 7's or something? Can these be replaced with a conventional speaker or is it too much hassle?

I dont want to go cutting holes or anything as you will probably understand.