I doubt that we have much gold here in Alabama, we're too far from the beach, and not much civil war fought here, so, that leaves coin shooting . However, we do have lots of iron in the ground (bad soil) and rusty nails. Will the GPX's, SD2200's or 2300's actually discriminate iron good enough to be able to go a little deeper than my CTX3030? My CTX is good for about 4" in worst soil and 7" at best. I need something to get a little deeper. The only PI's that I've owned is the original TDI several years back and presently have a TDI SL. The original TDI was deeper than the SL and I was thinking that I could tell small iron nails while adjusting GB would lose nails at "5" on GB then continuing to hear hi conductors on down to "3" on GB. I can in no way tell a rusty nail from a high conductor with the TDL SL. [size=large]Will any PI discriminate good enough to detect only high conductors? IF no, then I'm waiting on the Fisher Manta. Thanks, Joe[/size]