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Determining keyword on your website is not easy. I every built many websites, and I think keyword analyzing will take many times. Why I willing to spend hours only to analyze it? It is because the future of my blogs depend on the keywords. Thus, do not playing with this. If you want your blog successful in future, give him some hours. However, we usually hard to find a best one. We should choose the best. Why? Because sucks tool will widget you into the failure. Ok, I know your needs, I will recommend a tool here.
My reccomendation is: Google Keyword External Tool. SEOs principal is: use Google to beat Google! The best search engine will not make you fail. You can trust it because the tool is purposed for AdWords users. However, we also can use it because Google is kind. He give us a great one to solve our problem in keyword analyzing. The system will give you some suggestions. Just see the global search volume. 50,000+ searches per month is great, but I sure the competition also very hard.
A SEO master tols me that it is better to shoot thousands unpopular keyword instead shooting a keyword that give you nothing. So, be wise. See the competition. You need some months to enter the top 10. However, if you shoot an unpopular one, you can be number 1 only in few hours. Once again, be wise. Just use a niche that you master. If you interest in health, write about it. IfF you love Joomla, why not write a joomla tutorial? However, you also can hire content writers.