Relic Hunter,
I have used the White's XLT, the Minelab Explorer XS and II, the Nauti IIBA, and a Tesero Tejon. I bought the new Minelab Etrac in November of 2008 and I have not even cared to look back at the other detectors. All of them are great detectors when used to their fullest potential, but overall the Etrac just nails ever area that I have taken it to. I hunt from Suffolk to Petersburg to Richmond (Virginia) and it handles ever type of ground with the same performance. I mainly hunt Civil War relics, but I do like to hunt home sites (1700's to 1800's) and found that the Etrac beats every machine I have used.
The Nauti, when you are hunting non trashy areas, is a great machine with depth that will blow your mind. Put it in a home site and you will be digging like a mole and the weight......5 hours of hunting and your arm is done! My second favorite is my Tejon. My experience has been great with this machine. LIGHT and great depth! It handles well around here, but when I have hunted highly mineralized soil it gets difficult. Not much difference in performance between the Nauti and Tejon to me.
If it was up to me, I say the Etrac! It is well balanced, lighter than previous Minelabs, depth is great, many potential programs and options to suit any hunting you will do, and great discrimination.
These are just my OPINIONS and others may not agree so take that for what it is worth and good luck!
Wes