I don't work at selling pcs ;D ;D ;D don't worry about that :p
I'm just a user. And in whichever country I go (home or abroad), if it's not at home, I rent a flat, and one way or another I always manage to have a TV as a monitor for my computer (that's me though). Specially in uk, so cheap, and most landowners even leave a TV in the flat. While I was wrong about the 400hz (read about the marketing trick of Tvs) I do have right now 42inch Sony, it is 60hz. But tearing? Do you refer about the delay between the picture on the TV and the computer? If that's the case, I can reassure you that the Sony does the job AMAZINGLY well. All it takes is going to Game mode, and in a FPS you will not see any delay. You can google about the delays of TVs and see that the Sony Tvs have the lowest delay (if any) followed by Samsung Tvs. Personally, I can't see or feel a delay at all. One time I noticed, when I realized I was not in game mode x] and this is a problem only for pro fps gamers, where every delay/lag/spike can cause a problem.
And there is no standard of 120HZ so far. Standard means that at least HALF of the laptops use 120HZ and you know that this is far from reality. I wanted to get Alienware, but since I heard rumours about the quality and saw one of my friend's experience with an expensive Alienware, I prefer to avoid at least for now. But I believe it's a chance, just like the GPUs, each one has different overclocking capabilities.
Anyway, hope I didn't insult you in a way. And sorry for the late replay x]