I'm interested in purchasing a larger coil for the MXT. I was wondering if anyone here could shed some light on their performance or quirks that may assist in my purchase of any one of these coils. I have access to the beaches of Northern California and the Sierras, and the parks are primarily moderate to heavy in mineralization, and the beaches further north probably a little more mineralized. This has me leaning towards the DD1400 at this time (use the 10X6DD mostly). Have recovered some deeper items lately using the standard 9.5" coil. I'm mostly interested in ring and coin size items that I can recover from more measured depths. By going to the larger coil, will I be eliminating the ring and coin sized targets that are still in the shallow depths? Any info would surely be appreciated. Thanks and HH Rick