I own a Fisher CZ70 pro and I do like the detector a lot but am concerned about the age of it. If I have to get it repaired, the parts may be in short supply. I bought my wife a Delta 4000 and she loves it. I've been thinking about getting a Omega 8000. The only thing that is holding me back is the CZ70 has 2 operating frequencies I think 5khz and 14,5kihz and the Omega has 1 at 7 something khz. How is the depth on the Omega and how is it on jewelry? What is your advice?