As Marysz I also prefer the tools offered by overture, they give you more data about the number of searches for keywords and the exact costs for each ranking position for that keyword.
It also help you finding the combinations of more words relevant for your keywords that the searchers use.
Some top positions that place your sponsor link in the whole network will be very expensive but some times bidding high for the combinations of more words will bring more interested prospects (in fact they refine their search).
I hope these advices will be helpful.
xmx
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