I don't see the point, if I'm honest. Our main (and only) TV is a six year old cathode ray tube which I have no intention of replacing before it goes pop. In those six years, the "next big thing" has gone from digital, to flat screen, to LCD, to plasma, to digital again, to HD and to 3D. IPTV coming soon...
I'm yet to see what tangible benefit any of the above give, with perhaps the exception of digital and I have a set top box for that. HDTV and IPTV will converge over the next few years when fibre optic cabling becomes more ubiquitous and will probably become much more useful.
As for 3D, I've seen a few 3D movies, and whilst they were fun enough most of the fun came from the film itself and I'd quite happily watch them again in 2D (and in the case of Avatar and Toy Story 3, I have). Ignoring that, its still very much early days for the tech, and I reckon that if there is any genuine benefit it offers to the end user over the next five years its going to evolve very rapidly, to the point where the current TVs will be unrecognisable as "3D" - to buy now would be a mistake, in my humble opinion.