@ aussietanker:
There's lots of choice, but 8x18 ET45 is by far most popular on the Golf and its cousins.
And it's a no-brainer.
It does fit without any modifications with stock size 225/40 R18 tires, and because the
Mk.VII has a bit more space compared to Mk.V/Mk.VI even 235/40, at least if you do
the little screw mod. However, if you find a 8x18 ET48 or ET50, you're definitely fine.
There's another point worth mentioning: The wheel offset (eg ET45) does affect steering
geometry. Remember stock wheels are ET49 to ET51. For some reason it isn't a good
idea to go too far away from this.
If you're willing to spend some money on the wheels, consider lightweigt wheels like
OZ Allgeritas. The benefit is both better ride comfort, acceleration and handling. Even
more important: Get the best tires you can find. Never skimp on tires.
@ 2015GTI:
I'm new on VWs? Do a google search.
Pardon me, but I don't care what idiots ride. There's still some difference between what
some do and what is sensible. You're telling what some do. I'm telling what is sensible.
Anyway, it doesn't help newbies if you tell them what mad people do. Most guys on here
expect trouble-free solutions. So don't "help" them to damage there cars.