Kentman, beware "dealer tricks", or worse yet seeing something happen that's actually for real, but you don't understand what it was. (I'm not accusing the dealer of anything, just encouraging you to engage in a bit of skepticism. I've seen "dealer tricks" myself at gold shows.
I'm not knocking the GMT (I designed it) nor am I telling what to buy (even though I work for FTP-Fisher). Just sayin', you wouldn't buy a car just because you liked the way the engine sounds. If you're having to save a few bucks before you can buy a machine, you have time to do a bit of research and decide what to buy based on a whole lot more than what you saw happen at one booth at a trade show.
Since you have a few hours between now and the time you plunk down your money, I recommend you read my book "Gold Prospecting with a VLF Metal Detector", available as a .pdf file on both the Fisher and Teknetics websites. No matter what machine you wind up buying (even if it's a PI rather than a VLF, and we don't even make PI's), it will prove to be a valuable resource.
FTP-Fisher offers several machines which are competent gold prospecting machines. In our lineup, if you're a beginner, my recommendation is the Gold Bug Pro or the Teknetics G2 with the 5 inch searchcoil. Same guts, different externals. We have machines that will find tinier stuff (GB2) and deeper stuff (T2SE) but they are harder to learn how to use effectively as well as usually being more expensive. Again, that money thing, you're saving up for it. We aren't all so rich that we can see-and-buy something and figure out later if it was what we really wanted.
Steve Herschbach's website has an excellent essay comparing various gold machines. And he's just about as unbiased as it gets. For anyone contemplating buying a gold machine, it's a very good read. Sorry, don't remember the URL but it's not hard to find.
Wishing you the best whatever it is that you get,
--Dave J.