I happened to be in the plumbing section of lowes today and decided to look at their RO units. well there was a whirlpool RO unit for $170. I was thinking of saving up to get one. I have so many plants its hard to keep the house stocked with distilled water. do you think this is a good price, and a good investment?I think $200 is the max amount I can spend. does anyone know of any other good priced RO units?