We have OEM windshields available here. They are more expensive, but from what we've seen, if you have rain sensing wipers, it is worth getting the OEM glass. Sensors don't seem to stay attached to non-oem glass as well - judging from the dozen or so Q50 windshields we've had replaced at our shop over the past 3+ years.
How much do you charge for OEM windshields ($USD)? I want to know so I get a rough idea of what they would charge me here in $CAD because where I come from, it is only a matter of time before I see a significant crack in my windshield too (already had some chips which were visible 2 months into owning the car).
I also want to know what brand they use as OEM? My previous experience with Nissan (my Maxima) had "Nissan Carlex" windshields but last I remember, this Infiniti did not say anything like that for branding/labeling..