Go for the D.W. I paid $230 for my 2 1/2 incher, five years ago and it's worth every penny. Most D.W. models have a user changeable barrel. If CZ puts the barrels (with shrouds) on the market again, I'll jump on both the 4, and 6 inchers. The last MSRP for the D.W. was $725.
Mine had a problem of the occasional FTF. I took it to a gunsmith, and for $25, he replaced a spring. Now it shoots like a dream.
Mostly I practice with .38's, but I keep it stoked with Cor-Bon .357s. I keep three reloads with me in the car, some .38's, some .357s, plus some snake shot.
It is my "always" gun.
There is more insight on the CZ forum.
Feel free to P.M. me if you have any more questions.
I don't know about your experience with buying used revolvers. See this site: http://www.handloads.com/articles/default.asp?id=19
Years ago when I used to shoot alot and owned alot of guns, I had 3 Dan Wessons a .22, .357 and a .44mag, I had 3 barrells for each and none of my friends S&W, Rugers (which I owned also) could out shoot or perform them. If they are as good as they used to be GO FOR IT! dang I shoulda kept them and got rid of the ex.