HT room screen sizing and recommendations please?

My new HT room is about 16' wide and 10' tall but only 12' deep. Sitting position would therefore be around 11' away from screen max. Seating wise I only need something like 3 abreast so no worries about not having more seats behind.

My worries are that the distance may be too short for an 80" or slightly bigger sized screen. Also, not wanting to place the projector directly above the seats, would the projectors' throw be too short? (i.e. around 8-9')