I am going to get another coil, but which one? I have the Digger and 10x5 HF DD, but I am trying to choose between the WOT 15" 3 kHz and the 9" LF concentric, I like the coverage and the depth of the WOT, but I also like the depth and flexibility of the 9"concentric where it might also be a little better for shallow lake wading. I am impressed with the Digger and Coiltek's products, that's for sure. I don't really want 7.5khz for my needs. What's everyone's thoughts, picks and pans?