Well my friend you have found the rabbit holes and many with bear traps in the bottom. First off do not buy a detector just for a trip. Think about how you are going to use a detector when you get back home. A detector is an investment into your mining future and the wrong one or one bought on impulse is not the best methodology for long-term success.
There are a lot of great detectors in the market today and knowing what you need over want is a must.
Ask yourself a few questions.
1, Do I live in gold country and want a dedicated prospecting detector?
2. Do I live in an area where I will be prospecting and coin-relic hunting?
3. Would a X over machine work better for me in the long run?
If you are choosing a gold machine, look at the ease of operation and is it something that will grow with you as you hone your skills. Many Detectorist outgrow their detectors in short order. You begin to want that one more adjustment level or that one more coil option.
If your needs are more for a Xover then you need to look at detectors that have a true prospecting mode with an adjustable threshold and finite sensitivity setting to assure that you have the ability to be able to work through the ground in a way that will be successful.
I tool a couple of detectors to GKCAA with me and found that both worked well in the moderately to light meneralization of the areas that I prospected. But I choose the detectors I took up there with me not for how they would work there but how they work where I am the other 10 to 11 months of the year.
Feel free to email me or post here If I can offer you some additional information or after you narrow down your needs list.
You are going to have a blast up there lets just make sure that the rest of the time you have what you need!