Idea #3 - Google Base for buyers

Google Base is all about sellers, corporate sellers, individual sellers, sellers for new products, sellers for used products. What about a market places for buyers? Imagine a channel where all buyers post the type (and price range) of products they would like to purchase; imagine all related marketing research is delivered to the buyer seamlessly. This may include the lowest price available (taking into account of tax and shipping cost, possibly savings in product bundling), ratings for seller credit history, ratings for customer service, and projected price change in the near future, etc. All targeted product information is automatically fed to the buyer, RSS enabled as well, smartly, quietly, and unintrusively!