Mine is a whole scene so... here it goes

Scene: Cell is trying to draw out Gohans power

Hercule: Oh no I threw him too far!
Android 16: Gohan... listen...
Gohan: Android 16!
16: It is not a sin to fight for the right cause. I know how you feel, you are gentle and do not like to hurt. But there are some people words will not reach. Please drop your restraints, protect the life I've loved.
Cell: Ughh, this sentimental downpour is killing me. Thanks for the help 16, but I plan on doing this my way.
16: Please, you have the power. My scanners sensed it. Just... let it go...
*Cell steps on 16's head, killing him*
Gohan: 16... you loved life, you gave everything up to save it and you were just an android... I let you die, I can't do that... I won't watch anymore! I... I feel it slipping! And I won't watch this anymore!!!
*Gohan begins releasing his energy*
Cell: Incredible!

Napa: Vegeta what does the scout say about his power level?
Vegeta: IT'S OVER 9000!
Napa: What?! Over 9000

Nice, I like that one too. But I like mine because it leads to the coolest transformation and most epic lead up to it.

There is only one I know, and it is the most popular one.
Even someone above posted it.

"Vageta, what does the scouter say about his power level?"
"It's over nine thousand!"
"What? Nine thousand? There's no way that can be right!"

Over 9000 is really the only one i know. Havent seen DBZ in a while. But, anybody seen the abridged? If so, we could add abridged quotes to this to expand on it.

Is the abridged version also re-dubbed?

my favourite qoute is..

Vegeta: Trunks, how bizarre he has the same name as my son. Wait a second a super saiyan from the future... Of course! It has to be! HE'S MY SON! UNBELIEVABLE

I like that one too. It took him so long to put two and two together, when he finally realized it was quite a face-palm moment.