Make a keyword research tool similar to terapeak for eBay

Make a keyword research tool to scrape sites like Google, eBay, and Amazon for the highest ranking keywords. So the title will make search ranking higher on eBay. Terapeak has a tool like this I don't want it copied I want something original and better. If you don't understand ask as I will most likely give the winning candidate another task similar to this after the work is approved. API, Scraping, Data mining, PHP, Java.