Soft Water Inquiry

We are looking into getting a water softner. We've been trying to tough it out thinking that maybe we can get by with the nasty, hard city water until we move, but we are thinking that having soft water could really help out the itchy twins and their terrible skin issues. Here are the questions that I have for those of you who may have a softner or know someone who does...

1. Brand names? Recommendations?
2. Cost?
3. Did you buy one or rent one?
4. Where did you buy/rent it from?
   
5. Do you also have a filter on top of the water softner?
6. Did you notice a difference?

If you have any input you feel would be beneficial you can comment or email. I appreciate any help.