It sounds like a good plan at first, but I don't think the older units can get you far enough in the ground to find the deep ones. The lower frequencies do hit better on copper and silver, but that doesn't mean that the upper frequencies don't hit on it. Plus when you factor in mineralization, the upper frequencies (like 15Khz) may even be the better choice. So I don't know how to steer you but to say I've tried buying some of the older units and I quickly learned how far new technology has really come lol I can't go back. I don't know how oftem you hunt, but some of the members have some pretty big clad totals for the year. Maybe combining your clad and your old machine, may get you into an E Trac or V3i. That would be the ideal situation for the deep coins, but that's just how I would do it. Someone may have a better idea.