Hi.. For doing Keyword Research and to find out keywords - this tool from from Google was always the amazing one https://adwords.google.com/select/Ad...ingPreviewTool. By our setting, It shows the ranking of keywords in region wise. Then for finding multiple keywords use Rank Checker from SEO Book toolbar.
Google Adwords, absolutely this is the best tool for the keywords research. as it shows you the overall result for a particular keywords. But one needs to understand about the keywords because 1 keywords may be searched much time but it also creates competition. So a good analysis must be done.