Off the top of my head, here are 3 works of art that for me combine all three of these factors to produce a genuine "wow" feeling when I saw the artwork:
1. Vision of Spain by Joaquín Sorolla y Bastida at the Hispanic Society of America. This is the most recent - just saw it in June. I caught a glimpse of it from another room and practically ran to it. It surrounds the room and is quite overwhelming, but in the best way. (Note that no reproduction I've seen of this does it justice.)
2. The Boxers II by Carl Moore. I actually gasped when I saw this. Maybe not right away, but when I realized what was happening in the painting, I really did gasp. I love everything about this painting - the subject matter, the action, the simple lines, the composition, the colors, the fact that I didn't see the action right away.
3. A Love Supreme (Summer) by Sedrick Huckaby. I saw this at the Studio Museum of Harlem in January of 2006. When I think of a well-painted painting that immediately calls to mind a hundred different references, but is also just a gorgeous thing to look at, this is it.