I agree with Niko. Although your water is not terrible it is not super soft and you will develop scale over time. You can assemble a system for very little money if you buy the parts directly from http://www.wateranywhere.com/
. If you want to make life "easy" buy the filter/softener system from Chris' Coffee and then buy all of your replacement parts (softener and carbon cartridges) from wateranywhere for a fraction of the cost at any of the coffee dealers.
I like the following test strips:
which I buy individually wrapped so that they don't get damp and stay reliable and fresh. They are much cheaper if you buy the bottles.