Can anyone recommend a good screen protector for the SP3? I will be using the pen and one-note functionality quite a bit. What has been the experience for ppl with the SP2 using the self-healing screen protectors? Any good PET film protectors, these are the best, but can also have a lot of cheap knockoffs that peel? How about glass ones, this would look the oddest, just want to know if anyone has use them.