On the following sites, you can find out what your property is assessed for and what your taxes are and what you paid for your home. And you can find out the same information for your friends and neighbors.
Sumter County Board of Commissioners
http://sumtercountyfl.gov/
Sumter County Property Appraiser
http://www.qpublic.net/sumter/
Marion County Property Assessor
http://www.pa.marion.fl.us/
Lake County Property Appraiser
http://www.lakecopropappr.com/