First if there's anyway possible buy a straight shaft not the S shaft. The balance is so much better. Secondly, no worries Coiltek is making several different sizes from small to 15" WOT for the GT. Also there are a fair share of used ones popping up daily on various forums and Fleabay. I had a 13"Ultimate and loved the lightweightness and depth. I would keep the 10" and have a 6" for trashy areas and a 15" wild orange thing for the wide open spaces! I'm trying a 12x8 Tresureseeker on the Etrac next week! Coiltek Manufacturing - Metal detector coils and accessories