Welcome from another Kiwi, (or should I say "Chur bro"?)!
The Scania is the most popular Euro truck Tamiya makes, so good unit to start with as there is loads of aftermarket support for it.
Up to you which radio you go with, I have had the Futaba 4VWD's and then the 2.4 4VWD's which are good basic units that work well with Tamiya's MFC sound units should you choose to go that route.
I then bought a Spektrum DX6 (black newer version) which will not work with any of my trucks with a MFC, so I am going to sell it and buy a Taranis X9E soon. Different people have different experiences.
You will enjoy the build, these trucks are in the deeper end of RC building, but the manuals are amazing and easy to follow.
Buy a bearing kit before you build.
Decide if you want sounds/lights before you build.
Here is my Scania, still not finished yet:
