My favorite moment in RotJ has to be the final duel between Luke and Vader.
V: You can not hide forever, Luke.
L: I will not fight you.
V: Give yourself to the Dark Side. It's the only way you can save your friends. Yes. Your thoughts betray you. Your feelings for them are strong. Especially for.....sister. So, you have a twin sister. Your feelings have now betrayed her too. Obi Wan was wise to hide her from me. Now his failure is complete. If you will not turn to the Dark Side, then perhaps she will.
L: NEVER!!
Cue timeless male choir as Luke attacks Vader with all his might. I truly powerful moment. You know, something both prequels lack(I still like them though). Oh, and Jimbo, someone of your age shouldn't have such horrid grammer. If I didn't know better, I'd say English was your second language. At the very least, use a little thing called spell check, please. It will add much more credit to your opinions.