I've been out of detecting for a few years due to medical problems. I finally can get out and detect and am interested in getting a different search coil for my Spectra. Never cared for the D2 coil and mainly use the 6x10 and 5.3. I need a coil to replace the D2 and don't want a concentric. Anyone have suggestions on a good coil? Before I had medical problems I had thought about one of the SEF coils like a 10x12 but thought I'd check and see if there wasn't another option. Thanks for any help.