As a total newbie, the more I read the more confused I become. I was leaning towards a 2300 as a first machine to use when I move back to AZ. But I was looking at the 4500 and 5000 as the price where I am are all within 100 bucks of each other. Makes for a tough choice........BUT then I keep reading about the GPZ and the size and depth increases it affords and I think that is the machine I will ultimately want anyway. I am new to the detecting(read zero experience since the 80's), but not to pro