What is the best keyword selector tool I should use?

I'm looking at doing some PPC and search engine optimisation, but I have been getting stuck with the keyword research (it's a lot of work!).





Which is the best tool to use? I don't mind paying for one, but it must be worthwhile!





Thanks!|||I use www.NicheKeyWord.info.





This will give you all the keywords you will ever need. It does cost money but I believe they have a 7-day trial you can use. I highly recommend it.|||Google Adwords Keyword Tool is the best since it can give you an idea of the most searched keywords and their associates cost per click - simply go over to the Sorted %26gt; Views %26gt; Customize Columns and add in the Estimated Avg. CPC column.





There are also others, such as the ones by WordStream and Keyword Discovery. And if you are doing optimization for a video, there is actually a keyword tool (free) just for Youtube.





With exception to Google Adwords Keyword Tool, I added the links to the tools mentioned in the source, as well as a site that has a blog with some Adwords keyword advice that you can find some useful information on. I hope that helps!