If I'm going to seek alternative help to buy a new car, which one of these resources should I utilize?

I’m going to be buying a new car in a few weeks. I just searched for “buying a new car” questions on Fluther. I see some people have talked about Edmunds.com, Consumer Reports and Carfax.

Have you used any of the above and if so, how did they help you and how good was their service?

Any other new car purchasing advice will be greatly appreciated.

I’m going to shop around and purchase toward the end of March, which is the end of the month and the end of the quarter, which I figure could be to my advantage as far as the salesman wanting to make a quota.