I say kill Lando or Han. Either one. Doesn't matter. As long as someone important dies, it gives a sense of sacrifice the film sorely needs - we need to feel that while the rebels won, it came with a price. So go ahead. I say you can even kill Chewie.
The point is not killing a character and just leaving it be - we also need to see the other characters react to it realistically. Everyone needs to feel the loss. So as long as that can be accomplished, kill anyone you want in ROTJ except for Luke.
And this comes from the guy who loves the Thrawn Trilogy. To me, making Jedi better is more important than preserving the EU.
Now I'll go back and read everyone else's posts in this thread. :-)