"Best" is a relative term. Things like pricegrabber, priceline, etc. can
often guide you, but in the end I've found it best to use a handful of
vendor sites that I've found to be reliable (tigerdirect, tufshop, newegg,
and crucial to name just a few). The problem with the results from the
comparitive sites is that you don't always get a quality vendor.
--
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Windows help -
www.rickrogers.org