Google Adwords is the cash cow for most online marketers. You can always make money with other networks, but if you are concerned with traffic, Google Adwords is a must try. In order to get the best out of your Adwords campaign, you need to have tight AdWords and the right campaign structure. Not only that, you need to be bidding on the right keywords to get the most out of your budget. No two keywords are created equal, and you’d be surprised how conversion rate could differ between two almost identical keywords. You can always use Google Adwords Keyword Tool to start your keyword list, but there are a lot of decent premium keyword tools that let you optimize your keyword list and find keywords that convert like crazy.

There are many premium Adwords keyword tools out there. You can literally spend thousands of dollars each month to subscribe to these services, but at the end of the day, you want to make sure you get the right set of keyword tools that give you the biggest bang for your buck. If you have been using those free tools for a while and want to take your game to the next level, here are 5 killer keyword tools you should try:

SpyFu: the best tool to get some spying done on your competitors and find new good keywords to target. SpyFu Kombat makes it easy to compare your campaigns against others. Ad history helps you track your competitors and find out about their tendencies. And you can always export your competitors keywords and find out which ones you are not using.

Keyword Spy: another killer spying tool for online marketers. It also has a lot of awesome features for affiliate marketers. It’s a bit more pricey than SpyFu but does come with features for more advanced online marketers.

Wordze: WordTracker used to be the king of keyword research tools. But that has changed since the latest upgrade that Wordze has gone through. It’s hands down your best friend if you are into PPC and SEO. Provides you with all the metrics you need to find out whether a keyword is worth going after.

PPC Bully: one of the most affordable and more popular keyword research tools designed specifically for PPC professionals. It allows you to study other people’s campaigns and see what’s working for them.

Adwords Accelerator: another great tool to find high converting keywords for your Google Adwords campaigns. It provides lots of keyword ideas for your market, allowing you to expand the scope of your advertising and lets you quickly extract keywords from your competitors’ websites.

There you have it. Most of these tools are pretty cheap but they let you get more out of your Adwords campaigns fast. If you want to go beyond the free tools offered by Google and other players on the market, the above tools are a great place to start.