Which websites provide alternative listing of Mac App Store content?
Solution 1:
AppsOnSale is a Mac app that shows an alternative listing of apps than the MAS.
Solution 2:
Matt Neuberg from TidBITS reviewed a service called "Appalicious" last fall. He was impressed with the various ways Appolicious had to slice and dice Mac App Store information. I haven't used the product myself, but it sounds like it may meet your need for a more sophisticated way of sorting through Apps.
Since Matt's review the program has been renamed Appcuity, and is available here.