As for coils I decided on an 8x6 sef for my shooter. Once I can find one, that will give me the 10x12, 6x10, 9.5 and the 8x6. I think that's a well rounded arsenal. For headphones I bought a pair of auvio wireless from the shack. The last thing I need is a good digging tool. What I normally use is a small shovel. Makes me look unprofessional as all heck. I know most of you use knives. What is a good brand to pick up and where from?