I did very extensive research before I bought my car (Acura RDX) and I want to share few things that I found very helpful.

First, read article below. It goes over necessary information that you need to know before going to the dealership.
http://www.smartmoney.com/spending/a...-wont-tell-you

Second, visit websites like:
http://www.truecar.com/index.html?so...gnId=xJS_AC_tp
You can find price report as well as contact a dealer who has the best certified offer.
http://www.edmunds.com
It will help you to get clear idea about car prices.

Third, check out enthusiastic forums, you can find specific car review.

P.S. http://www.dealerrater.com has dealerships rating, which could be very helpful.

Please share your tips and suggestions.