As much as T3 is KOTOR's R2D2, I'd have to say GOTO b/c it's proven itself to be much more versatile than just about any droid in the SW universe (that I've read about/seen, at least).
Now, I want you to remember that no bastard ever won a war by dying for his country. He won it by making the other poor, dumb bastard die for his country.---Patton
There is no room in this country for hyphenated Americanism.---Teddy Roosevelt
I never forget a face, but in your case I'll make an exception.---Groucho
And if you all get killed, I'll piss on your graves.---Shaman Urdnot
How would you like to own a little bit of my foot in your ass.---Red Foreman