I've got a whites 6000 di series 3. I want to buy a new detector but can only afford one. I will be hunting mostly coins not prospecting. Would a whites xl pro, which is an improved version of what I have, or a minelab exterra 50 be better? Why? I know whites is dropping the xl. I know there is someone out there who has used both. I wish he would give me an honest answer. I need the help.