I was actually going to recommend that exact episode for the exact same reason.About a half-dozen iconic quotes immediately leapt to mind...but the first was "Let's make sure history never forgets the name Enterprise," from the TNG classic "Yesterday's Enterprise." Which is an episode I would recommend on the slightest pretext anyway!
Let's have an episode with a memorable space battle.
A memorable space battle... DS9's "CALL TO ARMS" or "THE WAY OF THE WARRIOR".
Find me an episode where time is a plot point but time travel is not actually used.