What if the insurance company no longer offers your plan?
You can still go to each insurer and price compare without going to the .gov jungle.
For example, shop.anthem.gov (what I’ve most recently used) shows me available policies for 2014 based on my zip code and the ages of my dependents. No other info required for a quote with details.
(I just looked and premiums are about $200/mth higher than they were back in September when I looked for our family.)