The Avatar DVD comes in Blue Ray, regular DVD and perhaps 3-D.
I do not have an HDTV, so I rented the regular DVD, and it was entirely adequate, with no glasses required.
There are none of those stupid scenes where it looks like something is about to poke you in the eye. All in all, the special effects were the best I have seen in any film, anywhere. It might be nice to see it in 3-D someday, and I would not buy it just yet, as they have not released to DVD with all the extra stuff on it.
It is a great film in pretty much every way. Somewhat predictable, perhaps.
I think 3-D is going to be the next big thing. I don't really appreciate it enough to pay much extra for it, but I am not most people. They are already selling 3-D TV and it will take off bigtime in three or four years.
I tend not to be an early adapter for things that have no obvious benefits. I have a 36" Mexican made JVC TV that I bought used for $125 with the table. It took two of us about an hour to get it into the house and set up, because it weighs a ton. But it does have a great picture, for a non-HDTV. A friend of mine paid $2600 for a 42" Samsun plasma screen that lasted less than a year. This was several years ago, when $2600 was a bargain price.They replaced it under warranty after three months of pestering, and by the time they did, the regular price for a set with the same size screen was down to $1500.
I do have a 22" Acer LCD monitor, but I did not buy it until my old 20" HP monitor died.