I am thinking of getting a new front or rear projector for my HT. My room is about 18 feet deep with two rows of seating. My question is: If you are veiwing SD, how big is too big? In other words, does the picture wash out at a certain size or bigger with SD? I realize that with HD almost any size will work but when I looked at some SD programs on front projectors it was disappointing. I am thinking of a 72" or 82" RPTV vs a front projector. HD and DVD may work but I still end up watching SD half the time, is it watchable on the bigger screens? Ideas, thoughts?