So i have a 14x18 room seating is about 12-15 feet range light controlled painted black. I have a benq1070 and am looking to buy a screen. Been looking at 135 or 150inch dont know which yet. But its going to be a elite screen ethier the starling tension which is about 900 bucks or a manaual which is about 300. Thoughts i mean i can leave the screen down most of time if i wanted. just debating if the extra 600 bucks will result in a better picture?