I would highly recommend Water Solutions.
 http://www.jugfree.com/
  
 Len the owner and his team(family) are very good. Local business and will take great care of you.
 I was going to go with Culligan but after comparing prices and a company with knowledge I chose Water Solutions.
 These guys actually call you or send you notifications VIA email if your system needs a filter change or whatever you may want.