I went with gti manual springs on the front of my 16 auto sportwagen. I have the LE that has pano roof and other options. I got about 3/4". I used S3 springs with TT pads on the rear though. The rear is about 1/4" lower. Original plan was R springs for the rear, but I found S3 ones and thought they were the same. They are not. They are shorter. I have a gti rear sway bar, but have the pp bar ready to go in. Even with the gti standard bar, handling is way improved.
I'm guessing on a regular golf, you may get up to 3/4" if you use manual springs on an automatic golf