Lorn - Diamond
The emotions evoked by Atari 5200-level graphics (combined with the song of course) just blows me away and has put a lump in my throat more than once
Lorn - Anvil
Futuristic, mysterious, beautiful
Pink Floyd - Empty Spaces / What Shall We Do Now
Edit to add UNKLE - Eye for an Eye. It's lost a lot of pixels since it was uploaded but it's still pretty wild.
Honorable Mention to Carpenter Brut - Roller Mobster
This is a fan-made cut with footage from a movie, Jin Roh - The Wolf Brigade, so it's kind of cheating, but it's still striking and was my introduction to Carpenter Brut