Well you don't "need" the rail... but it is handly, and that little extra weight can add to the already easy shooting of the CZ.
Let a guy at the range today shoot my CZ in return for letting me shoot his SA M1A Socom... He never shot one before and said that it was a smooth shooting pistol.
What was said above about DA/SA is why I suggest the CZ... and the SP-01 Tactical model with decocker is a great choice, but the standard safety version is good, just learn to lower the hammer safely. (Its not hard)
I actually kind of want a SP-01... even with my current line up.