I wouldn't put those that high at all. I would say mounts, springs, sway bar, and short shifter are all way more worth while upgrades, and a difference you would actually notice. Brake fluid is more important than the lines even.
Looking at the list one thing that really jumps out as not worth it are the stainless steel brake lines. I doubt your GF plans to turn the golf into a track beast, and with what I'm assuming is a street car you should probably put the money elsewhere.
I wouldn't put those that high at all. I would say mounts, springs, sway bar, and short shifter are all way more worth while upgrades, and a difference you would actually notice. Brake fluid is more important than the lines even.