Hi Bone.
The Garrett Sea Hunter is a fine pi detector. It is very heavy, but it can be hip mounted which I strongly suggest. The only thing I find laughable about the Sea Hunter is it's so called "discrimination". PI detectors have next to none. And apparently you slaughter your depth the higher you tune the discrimination knob. I honestly think Garrett would do better if they just put an on/off switch on the Sea hunter and left it at that.
A little less expensive than the Sea Hunter is the Tesoro Sand Shark. Now I am going to admit right here that I am a Tesoro loyalist, so you need to take that into account. I find the Sand Shark to be every bit as effective as the Sea Hunter and any other pi detector out there. And try and find one other pi detector that is backed by a lifetime warranty. Oh yes, one other beautiful feature of the Sand Shark is that the volume control is right there at your fingertips. You do not have to open the control box to adjust the volume. You'll be glad to have the feature.
As for the White's. I was unimpressed, I have to be honest. I liked the weight of the detector, but trying to control that 12" coil felt like I was swinging a garbage can lid that wanted to float on the surface of the water. Some people don't mind it, but I sure did. It is supposed to be more sensitive to small gold, but as I didn't find any while I owned one, I cannot say.
Everybody is different and this is just my opinion, which isn't worth more than anyone else's. I hope you get the chance to try a few out before making your purchase. You might feel differently and think I'm completely wrong.
Good luck with your choice.