Have never ventured into wrapping myself.
If I had a white or red GTI I'd be tempted to try out the black roof finish - but I don't think the look would work so well with a CSG colored car.
If you're not looking at changing the color and purely looking from a protection point of view you can look at the 3M clear vinyl wrap, I believe a few people on here had it on their Mk6s.
If you are considering a full wrap at some point to change the look then I'd definitely be doing a search or seeking opinion from others to ensure you end up somewhere that is going to do a good job, one that looks like a respray - I can't recall any GTI/Rs on here having it done but there have been a few Polos and Sciroccos done.