also my answer is same, google keyword tool is very good for keywords reach. now a days google change tool analysis result. result is very fast and too much advance.
You can use Google Keyword Tool, Traffic Travis that can be downloaded for free, Market Samurai, Micro Niche Finder and others. You can also use Google Trends to analyse if you niche is seasonable or an evergreen niche. In my opinion Google is a great tool but sometimes is return some weird information. The best tool ever in my opinion is Market Samurai. This is a killer tool for marketing and keyword research. I use it a lot and it rocks. I hope it helps All the success online