My search marketing / PPC keyword list is growing and getting more complex to manage by hand. So I'm looking for tools that work with Google/Yahoo/MSN for managing hundreds/thousands of keywords across many ad groups. The tools I've look at so far are expensive, usually $500-$2000/mo and up, which is above my price range. Can you recommend reasonably-priced tools or services? Some of the features I'm looking for include: * keyword management across multiple engines (Google/Yahoo/MSN) * bidding rules - i.e. increase bid (and notify me) if we fall out of #1-3 PPC position, etc. thanks, LC