Welcome to NICO!
Steering rack you're probably best off getting a rebuilt one from an outfit like
http://rackdoctor.net/ . I think many people have used that place and have been very satisfied. You can look up the price of the part there, and I'd expect a solid 3-4 hours labor to replace it, so at the end of the day you're probably looking at $500.
Which wheel is starting to "tick" or "snap", i'm assuming since you mentioned CV joint it's in the rear?