I have a gti 1500- older one with the 9" round scorcher coil. I was thinking on getting a better coil that would go deeper. I basically run on 'zero' as I like old anything so I will dig alot. I heard the 10.5 imaging is way to go- but also heard DD 8.5x11 or pro10x14 is best even though lose the imaging.. any opinions? P.S. my scorcher has weather cracks showing and rattles inside but is still working. Detector is 98/99 year. thanks