The Fishers are good machines, of the three that you listed the ID Excel is the most user friendly. The CZ 3D is a nice machine, but iron tends to give it fits.
The CoinStrike is a super machine in high trash areas, I have pulled coins out of some the worst trash infested areas that I have ever seen. The C$ takes about 50 hours of heavy study and use before the light comes on and you start pulling deep coins out of trash areas, about the time you think you understand it and make an adjustment, you find out you adjusted it the wrong direction. Most people sell their C$'s before they learn how to use them.
The best advice I can give you is to try to find a seller where you can try a few models out, be warned that this hobby is addicting and you will find your self spending a little to much time with your coil to the soil. Good luck and let us know which one you get, I sure there people here on the forum that will be happy to give you some tips.
TB