The best LAN J is the 787, actual full flat seats and a fairly good AVOD that's a little better map that the older one. There are a couple of versions of the 763 seats around, with the same basic layout and slightly different AVOD. I like the older version(blue upholstery) a little better since as far as getting some sleep since I don't watch a lot of movies on the way down to South America. The newer (red upholstery) isn't quite as comfortable for grabbing some sleep since it seems to be a little narrower than the old version. The new version definitely has better power arrangements and a little better video than the old version.
I'd assume that LAN is getting rid of the older 763s as the 787s keep arriving. I remember that they changed out the a lot of the A340s as the newer 767s arrived so I wouldn't be surprised if the older 767s are heading out as the 787s show up.