Voilà my Top 5:
1- J.R. says goodbye to Bobby in Pam´s dream ("Dallas": "The Family Ewing")

"Get me out of hereeeeeeeeeeeeeee!"
(Copyright: Patrick Duffy)
2- Pam sums up what a mess her life is to little sweet Christopher (aka Ugly Baby) ("Dallas": "End Game")
3- Karen lets dead Sid go and gets rid of that rusty old ring he gave her so many years ago ("Knots Landing": "Letting Go")
"Sorry Mrs. Fairgate but I can give you $10 only for this"
"I changed my mind. I´d better pull a Pollyanna..."
4- Fake nurse Katherine speaks to mummy Pammy about her (presumed) plans (too bad it was all a teaser) ("Dallas": "Digger Redux")
Were they ever sure that she wasn´t dead...
or that she was our Pam?
5- Angela´s final toast to her lands (and Wyman´s to her series) ("Falcon Crest": "Home Again")
Honorable mentions: I know that she doesn´t speak (with words), but I love that scene (from "Requiem") when Pam, in front of Rebeccabeech´s mansion, ends up crying for the latter´s death. She expresses a lot about what the character has had to endure up to that moment and the decision she is making about her future.

"I was painted in South America by Wes Parmalee
and sent by FedEx before the death of my model.
You know, the one who was Takapa!!"
Also: Greg´s "barbarian" speech to Titus Semple´s portrait, JR pretending that Jock was self-absorbed enough to have his own picture in his office ("The Phoenix"), Richard visiting on his own the gravesite of Jacqueline ("Cimmerean Dawn"), Cliff´s promise to Digger that he will kill JR ("A House Divided"), Pam telling Baby Chris that Mark isn´t "the same" as his daddy after sleeping with Mr. Moustache (I wonder if she was thinking about whether "size matters"...), and so many others (including that infamous "All liars" thingy from adorable Wacklaudia...)

"Eggs and toast, and some sausages on the side!"
I agree with a lot of your choices and it´s a treat reading your comments! As usual, I can´t avoid thinking that a top 10 would´ve been even more fun!