Check out CZ custom and Cajun Gun Works... both offer drop in parts for the CZ... upgraded parts... replacement springs... and both offer gun smithing work.
There is a little debate on if SS guide rods are good ideas for the CZ. I think some of the aluminum framed compacts didn't like it, can't remember 100% about the steel full sized.
Also check out
www.czfirearms.us it is a good site. One of the oldest/original cz site. Lots of good info on tuning and new sights.