I just started looking at RO machines. I am finding a large price variance (even for what appear to be similar capacity machines). I want to get a quality unit but I also don't want to spend any more than necessary. What are the key things to look for when selecting an RO? I realize this is open to personal opinion but I would also like to hear which machines others think are the best value? I have about 2000 taps so the 5 figure high end stuff is not even a consideration. Thanks for any input.