Replying to Help me pick a lens?

I have been perusing around the internet trying to determine what lens I should get to no avail. I know I want something that is a wide angle. Whether it is rectilinear or fisheye I am not really sure, but I don't think I want a fisheye because it can compromise image quality when I crop it down in order to put it in a rectilinear format? I am looking between the Canon 10-18mm f4.5, the Rokinon/Samyang 14mm f2.8, and the typical NS Tokina 11-16mm f2.8, Tokina 12-24 f4 and the odd one of the bunch: the Rokinon/Samyang 8mm f3.5 fisheye lens. I am looking for a lens that I can not only use for filming, but also for landscape shots as well as some stars and northern lights time lapses. (I spend a decent amount of time in the canadian wilderness leading canoe trips). They all seem to be somewhat decent options, apart from the fisheye, but I would like some input on which one would suit me best. I have been told to stick with canon, because thats what will have the best quality because the others are from 3rd party companies (not sure whether or not that is true). I will probably be using the lens about half and half between film and landscape shots if that helps at all.

I am extremely indecisive, and really would appreciate any input. Also I am somewhat new to digital photography and am overwhelmed by all of the options. I plan on buying some sort of wide angle lens, I would just like some NS input. Thank you so much.

+k for input.