I've had my ACE for two seasons now and I've found many wonderful relics and old/silver/copper coins. I'll post up my year end totals when the ground freezes. I feel that going to the largest factory coil gave me more depth this year with my ACE, but.......... How much of a jump would it be for me to go to the 1500 GTI? Another couple of inches in real world depth? More? What other advantages does the imaging bring? I really like my ACE a lot and will not sell it so I don't want this to be an ACE bash please. I just have no other frame of reference as I've never touched another detector. Please give me any/all opinions on the move up the line. I"m primarily a coin/relic hunter. I'm getting a REALLY good feel for what the ACE tells me through sound, does the GTI make the same signal tones? Thank you.