I would put my bets on Adwords. Their bidding system is the MOST advanced among any other PPC engines. Beyond the minimum bid, their emphasis on relevance, and click through rate to balance out competition between the monied and the brained is very intuitive and effective. Besides, as far as the search world's market share is concerned, Google has become synonymous with "search". We manage Adwords campaigns for a monthly $99 paid at the beginning of every month + 10% of monthly adspend at the end of every month. Let me know. Thanks, Samar
We manage Oveture too. For the same price. We'll give you discount if you want both Adwords and Overture.