I agree with low boy. Get the F 70. I recently got a mint F 70 for a great price to back up my F 75. The 11" DD coil on the F 70 is a killer. Not quite as deep as the F-75, but a great back up machine. Plus, the 6" coil works with both detectors and is very deep. Not much of a loss in depth, in spite of being only a 6" coil. Now if Fisher would bome out with a larger coil (say 14') for the F75/F 70, my arsenal would be complete. I've heard of the SEF coil, but hear bad things about them. I'm not sold on after market coils. I prefer the coils made by the original manufacturing.I haven't really used the T 2, but Andy Sabaches (I hope I spelled it right) website compares the T2 with the F 75, and he prefers the F 75. Since the F 70 is close to the F 75, I'd go that route if it were me.
keep on diggin'
jimmyk in Missouri