Hi all, just purchased a 2009 Mazda 6 Diesel sport. (with BOSE speakers)

Need to upgrade the stock non nav or bluetooth headunit
to one that has both.

Want it to be reliable, buy once have it for 5 or so years working faultlessly. etc

Budget 2k max, prefer 1500ish (Australian $$$)
Located Adelaide

That's got to include harnesses, the facia kit, etc.
Would also like a good reverse cam too.

Can anyone help me out with a guide? I've got no idea where to even start.
I've read things like, you can't upgrade a bose unit, then read elsewhere you can with the right harnesses so i'm entirely confused now.

I drive over 1000kms a week,
just want good audio, Bluetooth, navigation and reverse cam, with a good screen that i can see in any kind of light.
don't need android auto or apple play or any of that.

Kind regards Josh