All of these TVs are actually LCDs. LED actually refers to the way some LCD TVs are backlit. Older LCD TVs had fluorescent bulbs backlighting the screen, which gave uneven lighting. A couple of benefits to LED is that the light can be made more pure, they last longer, and it can light the screen more evenly. The newer TVs are LED edge lit now.
Then there are 60hz, 120hz, and 240hz TVs, but Leo doesn't like the "plastic" look of 120 or 240. Besides, broadcast TV is 60hz anyway. So getting a 60hz TV is best in Leo's opinion. It'll be more natural. As far as 3D is concerned, it's a matter of taste. Leo doesn't care for it.
He's also wondering if plasma is passe. Leo says absolutely not! Plasma is the highest quality display he could get and Leo advises the Panasonic Viera VT50. The only downside with plasma is that it uses more power and may have a lot of reflection in a bright room.