Tater, scroll all the way down to the bottom of the Tnet main page. Somewhere near the bottom is a list of the Tnet sponsors. Bart at Big Boys is frequently talked about on here as having made a super deal for one of us Tneters, the others do like wise. Talk to at least three of them.
I have the GMT and it comes with 6 x 10" coil and I would suggest also purchasing the 4 x 6" coil as it really gets into tight spots in and around boulders, bushes, downed trees and other stuff on the ground.
The GMT is setup as a turn on and detect machine and that is one way to use it. If you are wise you will setup a test garden of various metals at various depths to practice on as well as adjusting all the settings to see what they do. Use lead as a substitue for gold also cut off a quarter of a nickel and use it as a gold target and compare the values on the screen between the two metals. I found a beat up gold ring and use pieces of it glued to poker chips as test samples. When I'm out in the hills prospecting I Always carry a test chip with me just to help me get back on track from a bad target (bad target: brass ammunition casing, rusty nail, pull tabs, rusty can, lead bullet) The colorful poker chips are easy to see.
The GMT can also be used as a totally manual machine where you adjust everything.
The GMT can also be used as a partial manual and partial automatic system coupled with using the Grab button and having some of the settings at higher or lower settings.
All of this makes it a very capable machine and why I've found gold with it on several occasions and I KNOW it will find more gold for me. It has some interesting features that a person can choose to use or not use. It is a machine that gives a lot of information to help a person decide on what they want to do, dig or not dig. Recall that you will be out in the hills, along rivers and out in the back country of Calif and none of these spots are easy to dig in so having a machine that really helps you decide if a target has a high or low possibility of something you want to break your back on digging is Very Useful, IMO.
I've found pieces of gold underneath what looks like solid bedrock, only there is a tiny crack in it that allowed some gold to go down under it. The GMT as well as some of the others mentioned all find gold and they all have different operating styles/possibilities. I know the GMT best, I've used it several times to find gold and I know I will find more gold with it as long as I can get out into the old gold fields.
Good luck making a choice as it will not be an easy one...........................63bkpkr

me in camp in 2010 with the GMT and the rest of my "stuff". You will see in the picture that I have the 6 x 10 coil on the machine and just to the right of me is the 4 x 6 coil, no wonder my packs start out at 85 lbs

detected and panned gold, lead bullets, magnetic rocks. I would dig out a bucket of material, find a spot on the river bank with the detector that did not show a target signal, dump the bucket of raw sample on the spot and detect the pile. If no zip zip I would get another bucket of material that gave me a zip zip sound off the detector and then I would pan that pile, got gold every time the machine went zip zip.

about 1/4 oz of gold from that one spot that I found with a combination of detecting, panning, sluicing

here is the raw sample pile dumped on the river bank, the GMT with stock
6 x 10 coil and a classifying basket I use in a 5 gallon bucket full of water.