I love the C3's if you can find a pair. If you are willing to buy used and can find a pair of C3's for a grand less than the C1's, I think that's what I would do (assuming money matters). The C1's are fantastic, and if money doesn't matter so much, they're easier to find and you wouldn't go wrong. I think the C3's are just a very special speaker, though, and could easily live with them indefinitely.
And the "Best" Dynaudio monitor is...?
They've built quite a few monitors over the years. The C1 seems to be getting a lot of press recently but is it the "best" monitor they've built? For the money they should be but.....are they?