David,
A few questions first.
1. Have you had a water quality analysis test done on your well? If not, you need to have one done by the public health authority.
2. How pure do you expect your filtered/treated water to be? The answer to this question along with your water quality results will guide you in a certain direction.
3. How much purified water do you need the system to produce? This will determine the size of the system.
Water treatment is a field of stark contrast. On the one hand, the big chain stores and several "independent dealers" sell both teensy and under-performing units with bloated claims. On the other, industries and government entities are required by law to do it right. There is not much middle ground.
The best thing to do before you go buy anything is to research and understand the process. Water treatment is done in stages, kind of like an oil refinery. One stage pretreats the water, preparing it for more stages that are further downstream. Another stage will remove certain contaminants. Another stage will remove the pre-treatment. Once the water is sufficiently pure for some purposes, it can be drawn from the system before further purification is done. The higher the purity required, the more stages required.
This is another one of those deals where homework done up front and making those hard decisions early can save you tons of money in the end. A good water analysis will tell you exactly what you need to get rid of in your well water, and how much of it. Then you can begin to wade through the thousands of systems (90% of which are essentially the same) and select what you need.
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