Here's the deal, I have a bounty hunter that can get all US coins at 5.5 inches.(morgan dollar 6 in.) My budget is 200 dollars, and I am looking for a machine that goes at least an inch deeper than 5.5 inches. Can entry level machines like the ace 250, fisher f2, xterra 305, and eurotrek pro get at least 6.5 inches? I don't want to buy a new machine only to find out I bought the same machine I already have. Also, should I wait to find a good deal on a used machine, or should I try to find the machines I mentioned that come with the 11 inch DD coil? Is the DD coil any better than stock? What about sniper coils? Are they worth it? I really have to make these 200 dollars count, because that's all I'm allowed to spend. I could also probably get away with 215 dollars, but NO MORE than that. Thanks!