I owned the Contour 5.4's for about four years, and recently sold them to pursue another diection. They are incredible speakers, I won't belabor the point with audiophile jargon, but I'm sure you would be very happy with them. I have not heard the C-2's, but I have to think that the 5.4's are the sweet spot in the Dynaudio line-up.
Best of luck,
Dan
Best of luck,
Dan