I think the special editions are not good enough. There should be much more alterations to fit the new movies with the episodes 1, 2 and 3. Watching Star Wars in order of episodes brings a hard break after episode three in many technological means. I would at least alter everything that is not perfect due to the 70ies and 80ies technical limitations.
things i would like to be changed most include:
1. simple muppet show effects replaced by cgi wherever possible, of cours keeping the original designs but in a more living form. especially the bands in ep 4 and 6, jabba and so on. i never liked this, not even as a child (i have seen ep5 and 6 in cinema during their first release in Germany)
2. simple computer displays. fuck they had holographic battlefield simulations in ep 2 and then they have those fucking old display systems in ep 4 for example the display showing the death star aproaching the secret base or even worse, the fire controll systems inside millenium falcon, that looks like atari 2600 tic tac toe.
3. aged technology replaced by new high tech cgi versions.
4. some new scenes and altered dialogues to tie up stuff with ep 1, 2, 3, for example i would like to see imperator in small scenes in ep 4 and 5, he was introduced much earlier so there is absolutely no reason to keep him in disguise in ep 4 and 5, and i would like to hear the midichlorians at least mentioned one single time.
many stuff still is in a good condition and should be kept, but there is a lot to do to get 4-6 to a level equal to 1-3. i think a complete remake would be a big mistake, but there should be a lot of updates. thats what i would prefer. Of course the original versions should be kept in good condition to for those who prefer

Chris