That helps quite a bit. I myself have used machines from the big 6, Minelab, Fisher, Garrett, White's, Bounty Hunter, and Tesoro. All have very good machines. I can suggest several from each. By the sound of it, you are looking for a machine with the ability to notch the discrimination. That will put you into a machine with some sort of visual ID usually. Detecting style comes into play also. Some machines require a very slow deliberate sweep like the Minelab Explorer/Quattro, and some require a brisk sweep like White's DFX/XLT. If your main hunting will be for old deep coins, I would suggest the Explorer II from experience and from all the finds that people make, but you must take the weight and detecting style along with learning curve into account. I myself chose to purchase an X-Terra 70 from Minelab. It is a dream machine compared to most I have used. I am finding items at great depth, and the price was very reasonable. And to change to a new hunting style or to go back over an area that seems "picked" out, I can change to a different size/frequency coil and it's like a new machine. I did a boat load of research before making the plunge for a new detector. I have a closet full already. Now I have one detector in my bag and one backup for all my needs. And I didn't need to "learn" a whole new system. The X-terra 70 is very easy to use and I don't have to program it. That is probably the biggest reason for me to purchase. I'm not chasing forums looking for the "Ultimate Silver Program" to sit for an hour reprogramming my machine. Plus, it's really getting rave reviews as a prospecting machine. So I won't need a different machine to go prospecting, just change coils and away I go. If I lived close to ya, we could go beepin' sometime and I'd let ya swing my detectors a bit for a test drive. I think you'd be surprised at how well they work. You can read the forum for the X-Terra line and the others I mentioned, get a feel for what people are asking and what kinda answers they are getting. It's like having a personal service tech and pro right at your finger tips being on Find's Forums.