so i'm building a home and planning to put a home theater in the basement. i know very little/nothing about front projectors. i have a million questions, but i'll start with this (for now ) can't most projectors display in 4:3 and 16:9? if that is the case, isn't it smarter to get a 4:3 screen? lets say i get a 4:3 screen that is 80" wide (just to pick a number). that means i get a full 4:3 picture, AND an 80" wide 16:9 picture. if i get an 80" wide 16:9 screen, i get a full 16:9 picture, but a 4:3 picture that is only 60". is my logic incorrect?