big box stuff is crap, and Kinetico etc. are overpriced fooey.
Look for a system with a Fleck vlave, they are very durable. I installed a replacement in our home myself for about $500.
http://www.qualitywaterforless.com/Default.asp
Properly calibrated you won't feel that slimyness some experience, and I go through about 20-30# of salt a month.