I'm on the old-coded F519's at the mo and had no probs with them, so I suppose the best bet would be to go for the 321's as I believe they're the newly-coded F219's that were a slightly heavier disc-only version of the F519.
Unless someone can convince me of the strength advantage of the better alloy theory.
hmm, I've been thinking..I dont actually need new wheels, more that I want them. The DT hubs and alex dp20's are perfectly straight and seem tough so perhaps shedding £200 on new wheels is a bit silly?
..unless I could sell the old ones? how much do you reckon I could ask?