Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca
You need to look at the manufacturers websites to learn which ones meet your needs. Under ideal conditions detectors can reach depts of the dia of the coil. You need to pay more for power just like for cars. You need to be able to ground balance too.
Your answer is the Gamma 8 inches no problem good VDI and you can ground balance it.I think it has tone ID your wife would love it.It is also very light weight.The AT PRO would be good for your wife too some of my friends wifes are swinging them women love that machine.