Yes the Quattro is a good choice but the 16.5 coil will be a difficult swing.
I have a Quattro for sale with 3 coils, Grey Ghost headset, rain cover and book for sale..........take a look!!
SunRay S-12 coil is a better coil, is more precise, easy to pinpoint and greater depth.
I will include shipping to the lower 48 states if you are interested.............this is an excellent buy for a great machine, you will need nothing else.
I am strickly a water hunter now and I am not using the Quattro any longer and it is in excellent condition.
Please check the classifieds...........I am a regular poster here.