You could try plugging in your targeted keywords into the google adwords tool to see what the current bids are on them. See if any are paying more then 6.00 euros.

Analyze the content of your website and then find the keywords on Google adwords keyword tool. But i want to say that its not fixed price and the CPC can be changed according to many options like other ads, time of showing ads and like this options. There are many high paying keywords lists and you easily can find them but as you know CPC of these keywords are changing always.