Two words for you:
JAMES. TAYLOR.
Stevie Ray Vaughan's acoustic stuff is really good too. Just don't ever play Clapton's acoustic version of "Layla" for this dude or he will NEVER branch off from rap. "Tears in Heaven" is acceptable-ish. "Gallows Pole" by Zeppelin, as well as "Bron-Yr-Aur" and "Black Country Woman"... eh. They're heavy acoustic but acoustic nonetheless, and definitely in the "win" category.
I'll also throw down "ELM" by the Seatbelts as my high card, as well as put a second on Simon and Garfunkel. If you can find the acoustic version of "Try Honesty" by Billy Talent, do it. Got any Sondre Lerche? Do it.