Its really a matter of personal preference.
I've got adjustables on my 85 Combat, and they're OK.
But, practically speaking, once you find ammo or a specific load that your gun shoots well, its very unlikely that you'll change sight settings again. In that case, adjustables are an expensive luxury that serve no real purpose.
And if you ever plan to carry concealed, most adjustables just aren't good. (There are exceptions.)
Good high vizibility sights may be of more use, over the long run. (By hi-viz, I mean those with fibre-optic inserts.)
We've noted a couple of companies that sell sights for the CZ in some other messages here on the CZ Forum. Just do a search on "SIGHTS."