Ladies and Gentlemen: I need all of your valuable, experienced comments. I own a brand new, latest update, never used Fisher F-70 with standard coil and the F-75 DD coil. I also own a Fisher CZ-70 Pro with three coils; the small "hockey puck", the 8 inch and ten inch coils. I am only going to keep one of the detectors. Will you please help me choose between them. All pro's and con's will be greatly appreciated. Send me a P.M. if you want. My detecting consists of coin and jewelry hunting in very old yards and parks and I want to keep the deepest detector. Thank you for any suggestions;,input, pro or con. Dave.