if you'll go with a CZ, get an SP01 - why get an older design then a newer, slightly improved one is the same price.
What puts the SP01 ahead of any of its competition as far as IPSC competition shooting goes is the HUGE list of production division legal "factory" parts which allow you to greatly modify ("improve") both the SA and DA trigger pulls, trigger reset, etc, as well as things like lighter recoil springs, and a great set of sights (both front and rear).
Also, the SP01 is incredibly accurate, more so than any other Prod gun I've tried (I've never shot the M&P, but I owned a 226).
Plus it's cheaper than the Sig (again, don't know about the M&P).