Here are just a few resources for you to review as you consider a remodeling project.  These links are provided for your convenience. Home Canvas, Inc. does not necessarily endorse the statements or claims made by other companies.  
Fields Guide to Remodeling
Remodeling: Worth It?
Kitchen remodeling ROI - Return on Investment
2007 ROI for Home Improvements
Recoup Remodeling and Addition Investments
and there are multiple articles at ConsumerReports.org just search "remodeling"