When Adwords gives the user full research details, it will be a mighty free service. For now though, it's better to search around for a keyword tool that can give you competition analysis and full search results.
I always use Google Adword is the best tool to find n Research new keywords according to relevent work and site, it is very easy to use in nature, i prefer this for all
At the bottom you have a list of the best known tools with descriptions and links http://www.webiny.com/blog/2012/12/05/how-to-do-keyword-research/
Google adwords tool is the best keywords research tool, I also used this tool it give me good keywords for my website in which our website is No-2 page.
Most of above have suggested you Google adword keyword tool as the best keyword research tool. I would also go with them. I am also using this tool for two years, and always got best results for keywords research.
I guess most of the member would agree with me and say that google adword tool is the best keyword tool.
Google Adwords would be the best one but you have to make further analysis on your targeted keywords. See if your keywords capable to survive for a long term journey.