I haven't looked at Miche specifically, but I know that cheap dual-pivots can work just as well as expensive ones, from my experience with various. Some caliper arms are stiffer than others, but even the cheapest Tektro and Alhonga-copy ones I've used have been stiff enough.
However, you might like to pay extra for nicer cable adjusters or better brake blocks (if not replacing the blocks anyway), or lower weight.