I used AppShopper.com - it has a good search engine, but even better is a wishlist feature that will notify you of price drops. It also keeps a full history of App prices.
It has great banner ad's (I've "impulsively" purchased at least two Apps because of those, instilling in me a need I wasn't aware I had)
Also will notify you by mail of updates to you existing Apps if you happen to forget to check for updates regularly ...
VERY neat AppShopper.com is!
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