Since it's a basement, I'm guessing you have good light control. In the dark, for a movie night I would take the Panny all day long. Then again Samsung plasmas aren't too bad either and if this is mostly just going to be for the kids I see no reason to double your budget for a top of the line TV. If, however, you plan on using this as much as them, lighting is pretty controlled and you want the best picture possible the Panasonic is your TV. If the room is too bright, however, you'll almost definitely catch some nasty glare off of the Panny and a brighter LED screen might be the ticket.
Your best bet is to buy from a local place with a generous return policy and try them out in room. That's really the only way to know for sure which will be right for you.