Ecommerce Website Scraper

I need an application created that will do the following. - Go? to major ecommerce websites and scrap there websites for keywords within there site. -I would need the SEOT(Search Engine Traffic) numbers and SEOC(Search Engine Competiton) for the keywords also. Through Google -A proxy feature would also need to be added to allow the software to pull the SEOT and SEOC from Google. -I will also need the ablity to run a report on the data and display results by filters I specify.