After over a year of spending alot of time behind the GPX5000 I have found I use the stock 11" round mono most of the time. I really like the weight, depth,stability and sound of the coil. I have a CoilTek 18x12.5 too but everything sounds the same to me..... big, little, shallow, deep targets all seem to give off the same kind of sweet tone. It can get noisey too with EMI. The CoilTek Joey is a great coil but of course lacks on the depth. The Minelab Commander 15x12 mono is great but heavy. So I'm thinking about getting a new Blitz or Nugget Finder 14" and wondering....If you could only choose one coil what would it be?