Hey everyone, My grandparents called me up this morning saying that their current TV is on the fritz and about to go. They are in the market for a new 36" TV. Their concern of course is all the talk of the broadcast stations going to an all digital format. They don't want to purchase a TV and then 3-5 years down the road its not worth a darn because of the all digital format. I wanted to get some opinions on what they should purchase and what the differences are in the features. My grandpa was asking me specifically what the comb filter is. I have not researched digital sets yet because I cannot afford one yet. They watch alot of TV. They are not into movies and don't even own a DVD player. They have a Toshiba set now, but I don't know how brand loyal they are. Any ideas?? Thanks in advance.