Personally, I feel like CCP or SSP would be the easiest to get into without too much effort or disadvantage you too much with a stock CZ.
I run a P-01 Omega with the safety option in CCP. The ability to start in single action, cocked & lock for CCP is a nice feature of the division and, in my opinion, gives the compact CZs a bit of a competitive edge there as far as DA/SA or striker fired guns go. The P01 omega or P01 steel frame are my carry guns and cocked & locked is my preferred carry method, so the commonality is very nice there. Plus I kind of like the added reloads of the 8 rd CCP capacity (yes I am weird like that).