I recently went through the same issue of what to buy. I decided I really wanted a DFX with headphones and definitely, a bullseye pinpointer (too many coins are the color of the dirt and very time consuming to find). However, money dictated and I chose the Whites M-6 because of the company and the simplicity of use. However, like the better units, it has many of the features to help determine what is valuable vs junk. I find the combination of using multiple tones (I love to hear the high tones for silver coins), the VDI number, and block indicator really help determine what to dig.
It takes some time to learn to discriminate out junk. Most of us are always looking for the next trick to turn a hit into a gold ring, etc.
My buddy started with a Bounty Hunter from WalMart two months ago and promptly took it back. OK machine but just not set up well for the user. Then he got a Whites Prizm III (price was definitely his driving motivator). Two days later he upgraded to a Prizm V, but wished he had spent the money for the M-6.
If you want to spend a little extra, get good headphones and Double D 4x6 coil for junk filled areas or places where target overlap--parks, ball fields, etc.
Basic Detecting Data (BDD): Whites M-6, Bullseye pin pointer; Dayton Ohio area; Clay soil, winter and summer coin hunting; hunt city parks, playgrounds, and ball fields; detect 2-3 days per week.
Merry Xmas
May your pan always show gold and may your batteries last forever...
Terry