Picking the Perfect TV Stand

I'm trying to decide which type of stand to get for the new TV I want in the living room. There are several different types of tv stands just for the flat screens alone. I love the old entertainment center we have now but it won't hold the 55" screen TV I bought. I don't know what to do with that either. It's in too good of shape to just toss out, it's too big for most of the other rooms in the house, and is pretty much a specific piece. There's not much else it can be used for. Too bad it's too big for the new boat. I need a TV stand in there too.