I love the original SW with a passion (I was born in '72), but it's just too hard for me to give up ESB. Some of the best acting in the entire saga is in ESB, and it's a mature movie that respects its audience. ESB finds a way to give us something new and entertaining in the SW universe, and it doesn't feel like a re-hash.
Now if the question had asked if I would give up ROTJ and everything that came after it, I would have voted with a big, fat YES.