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I would definitely go for Market Samurai. So far its the best tool for me. Traffic Travis comes 2nd on my list

I use a lot of google keyword tool as well

same here - that's ALL I use. Great tool.

I am always use Google adword tool for keyword searching it always show good result.

Hi,

I only use Google adwords
It looks great

Market Samurai software would be good for you because in this tool there are various tools available for website. You easily analyze your competitors website or own website. I also used it

PROS:

This is one of my favorite tools for research online! Market Samurai is an application that resides on your computer (i.e., it is not browser based). It is one of the most complete tools offering keyword research in the areas of market competition, search engine optimization and pay-per-click advertising. The insight into keywords and its competitors are deep and since it is a desktop application, you are able to save your research rather easily. It also comes with other bonus tools for doing article research, social networking research and affiliate resource. It is an extremely complete tool and at an affordable 1-time cost, this should be a part of any internet marketers arsenal.

CONS:

Because this is a desktop tool, some might get intimidated by it. Download and installation is quite simple, though. Market Samurai collects most its data from many of the free tools that are already available to you (like the Google Keyword Research Tool). Still, it is able to extract and organize data much more efficiently than any of the free services. The compilation of various resources provides tremendous insight to the items it researches. Other keyword research services online may provide other details that Market Samurai provides. Personally, I have never found these metrics of particular interest and the added high monthly fees these other services require cannot normally justify its cost (especially since Market Samurai is a low-cost, one-time fee).

Currently using Google keyword Tool and Google Insights for Keywords Strategy..
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Google keyword Tool (FREE) and Market Samurai (14 days trial) will work awesome but in my opinion most important part of keyword research are not tools but your brain.
The key to find your golden nugget niche is very good understanding what is the competition, how many backlinks do they have, how good are those backlinks etc.

I used google keyword tools, but wordtracker is better to extract long tail keyword

For Keyword I totally depend on Google Adwords and wordtracker.

Had problems with Market Samurai using Adobe Air, I now use Traffic Travis Pro and find it so much easier to use.