I've looked and the Grand Wegas and a friend of mine has one - I think they are a nice alternative to regular projection televisions and not nearly as expensive as plasma.
For some one who has to have a big screen they are great, but like projection TVs they don't look as good if your not at a safe distance, (i.e. make sure the room is big enough - ask your sony dealer for details).
The one thing I advise you look into is the technology, what are the risks or problems such as bulbs burning out or issues with the display that you can run into with a plasma or LCD. It shouldn't matter though, the Grand Wega is Sony's flagship right now and they will take care of you.
I'm partial to Sony Picture Tubes, but if it must be a big screen the Grand Wega is good, please .. please go look for yourself in person ... its a big TV and like picking speakers that sound good to your ear .... picking a TV is all about what looks good to your eye.
Hope this helps .. Have Fun