Thanks Loopie, I have seen units for a bit under 300 or so that appeared to be good...... But I am not up to speed on these units so I am not sure if they are what I need. I don't think my city water is very hard.
I agree I would prefer to buy something of good quality, or not bother at all and keep buying spring water.
If I got one I would also send a before filter and after water sample to wards for analysis just to be sure of the water I will base my brewing on and because it would be interesting to see.