The Compact has the same dovetail as other CZs based on the 75 model, and depending on what you want, there are several available: PT sights, Trijicon (quit making them for a while, and then started again), Meprolights, and XS Sights. I have Meprolights on my Compact, but a set of PTs on a SA. (PT had some quality issues a while back, but the company has changed hands several times, and they seem to be doing much better, now.)
Note: the CZ front dovetail is lengthwise, so not just any sight can be made to work -- it takes CZ specific sights on the front.
Whatever you get, look for some that have a white ring around the tritium inserts.
The XS sights are particularly fast (to pick up, etc.) -- and you have the option of a large or small front sight when you order. You can also just go for the front sight -- which is the most important part.