Wow, that's amazing. Guess I'll have to go get the game after all these years...
Lots of good choices in here, although I'm a bit surprised (not the first one to be surprised lol) that nobody's mentioned:
Ninja Gaiden (XBox)
Riven: The Sequel to eh you know what
Uru: Ages Beyond Myst (any incarnation of the game)
Silent Hill / Siren (pick & choose)
My oddball choices: Thief: The Dark Project and Thief 2
Boogie Wings is a pretty interesting choice. I would've gone with another of their games but in honesty that's probably the most classically pretty of DE's action games, aside from Dragon Gun that is.
Gaiapolis by Konami for arcades is pretty sweet too.
Let's not forget Contra 4, either - the first stage is perfect, art-wise.