With your print, 1080P will be more than it holds, so I'd work in that resolution.
Remember it is not a scope print, (from memory it is 1.37:1) so the actual resolution you will be working with will be more like 1450 x 1080 or thereabouts.
I'd be aiming for a 720P release, but work in 1080P (i.e. 1080 lines).
You can always output then in 1080P if you want, but I don't think the data is there.