First off there's nothing different for the GTI PP to other Mk7 Golfs. Dutch will probably correct me but they all run pretty much the same width/offsets within a few mm. Check the first post for stock sizes but your Santiagos should be 19 x 7.5 ET51.
Running an 8.5 width rim with exactly the same offset will push the inside and outside 12.5mm further in/out. You'll probably want to go slightly more aggressive so as to give more clearance to your suspension/strut, however then you push out closer to your guards.
My suggestion would be 19x8.5 ET48 as a nice "safe" option. You may also need to look at what tyre you're running as you may need to have a slightly more stretched tyre (run stock tyre size) so that you don't get into rubbing issues with your guards. Also it will depend if you're going lower also (recommended to complete the look).
But if you're talking CH-R's then Dutch and AdamD have both spent the last 6 months looking at every angle and combination of this wheel so they are the best people to advise
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