In your list - Dynaudio would be my preference by far. You should also look into PMC speakers - like ATC they are very dynamic but are tonally less forward in the mids and could be just what you are looking for.
I agree DYNAUDIO S5.4's. I am slightly biased for I do own a pair of C1's. Never heard the La Folia but there is no comparision with the vienna's. A little more forward and more dynamic and better/bigger soundstage. Both are non-fatiguing but I personally like the dyn sound much more. A little more detail and speed with the dyn's too.
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