OK, here you go.....since I seem to be following you around the boards right now.....
look on
www.dealernet.com to get an idea of availability of the vehicles you're looking at.
Look on Kelly Blue Book and see what the suggested selling price on the particular cars you are looking at is (this is useful when you go to a dealer and want to negotiate a better price).
Browse sites like msn.auto.com and find consumer reviews on a particular car(you don't want to buy a car nobody liked or everyone complained of experiencing problems with).
Research, research, research!!