Well, mine was one of the older ones and was in rough shape.
The newer CZ front sights wouldn't work on mine (those that install from the front of the slide and have a pin that holds the barrel bushing and sight in place). Mine had the 1911 style front sight that has a pin/shaft on the bottom of the sight that protrudes down through the slide and even barrel bushing and helps hold the bushing in place. I used a 1911 front sight and needed a taller back sight, the LPA sights were bought as a set (front and rear) but I couldn't use the front sight due to the size/shape of the tenon on the bottom of the sight.
I replaced the barrel (badly pitted barrel and chamber.) I got the threaded barrel because the regular one was out of stock and I'm impatient. Had to modify the inside of the slide to fit a modern barrel to it (you shouldn't have to do that (I say shouldn't, how is your slide made, up front, on the bottom. Yours is a B model so it should be okay for parts replacement with modern parts.
I replaced all my springs but left the original internal parts installed in it (except for the barrel).
What parts are you replacing that cost $600?