Help with buying new unit.

[JonnyM]

Hi everyone, 

Totally new here so apologies if this in the wrong place. 

Im looking to buy a new pioneer head unit for my Audi A4. The trouble is there is so many, all similar codes and price ranges. 

Can anyone help me find the best one? I use an iphone I believe most come with that Apple play connection. 

So is there one that is better than the rest? Doesn't have to be the most expensive but would like it to have Sat Nav built in. 

Any help or advice is welcomed. 

Thanks in advance. 

Jonny.