use https://adwords.google.com/select/KeywordToolExternal Also try Google.com . Google has recently integrated Google suggest in the search box of Google.com. So, you can have a view of what the keywords are and how many searches are there.
Try this also : http://www.keyworddiscovery.com/search.html http://tools.seobook.com/keyword-tools/seobook/
I mostly use these two http://freekeywords.wordtracker.com/gtrends/ https://adwords.google.com/select/KeywordToolExternal
I think you should go with Google Adwords https : // adwords . google . com /select / KeywordToolExternal
hello friend in my opinion google adward keyword research tool is best http://adwords.google.com/select/KeywordToolExternal
Have you ever tried to read the posts you would not have posted your links. I have already posted that link.
I use google keyword external tool at: https://adwords.google.com/select/KeywordToolExternal and compare with the results from Free keyword Discovery tool and wordtracker tool. http://freekeywords.wordtracker.com/ http://www.keyworddiscovery.com/search.html
Insight are great but i am not sure how accurate they are? But there is no exact keyword tool, it is an (often inacurate) estimation
These are the best tools i recommend for keyword research the ones i have used or still use now too http://www.back-links.org/All-in-one-top-3-paid-keyword-research-tools.php If you want one to pay one time fee to then perhaps this would be good for you http://www.back-links.org/Keyword-elite-software-review.php