I am looking at upgrading the main screen in the living room and am definately looking at DLP. 103" probably too big in size and price for me.

And it is a plasma. I have developed a disdain for plasma over the years. I do not know if it is entirely healthy, but it exists.
So I am leaning towards DLP for sure. Somewhere around 50" would work perfect for my current set up.
I see the costco and walmart deals and they sometimes look enticing, but I think you are taking your chances from a quality standpoint.