Favorite space battles, I think Freespace takes the cake, just the whole game, from cinematics to the dog fights, it was truely spectacular. And fighting in hyperspace at the end against that mammoth ship was cool (I hid in its launch bay for a little).

John Criton: "Yea Yoda, little green guy, trains warriors."

O'NEILL: Jaffa jokes? Let's hear one of them.
TEAL'C: I shall attempt to translate one O'Neill. A serpent guard, a Horus guard and a Setesh guard meet on a neutral planet. It is a tense moment. The serpent guard's eyes glow. The Horus guard's beak glistens. The Setesh guard 's nose drips.

Urgo: He's gonna scoop your brains out with this big scoopy thingy...

CARTER: P4X 884 looks like an untouched paradise, sir.
TEAL'C: Appearances may be deceiving.
O'NEILL: One man's ceiling is another man's floor.
DANIEL: A fool's paradise is a wise man's hell.
O'NEILL: Never run with scissors?
HAMMOND: Were you trying to make a point, Major?

and my favorite quote, though not scifi its related in a round about way

"Writing for a penny a word is ridiculous. If a man wanted to make a million dollars, the best way would be to start his own religion." -- L. Ron Hubbard