[mptoledo]

I was a New Car Sales Manager back in the late 90's(no BOO"S Please). Here are my 5 rules in buying a car. I have also given these to my friends and relatives. Stay away from extended warranties, and if your financing it go to your local bank or credit union before hand as you most likely will get screwed by the dealer.

First off: NEVER EVER TRADE IN A CAR!! I mean NEVER. There are too many ways to sell your car. If you don't sell it yourself then Please don't bitch about what your offered. Dealers can go to auction and pick up as many cars as they want at mind blowing cheap prices.
Second: Always bring competition into the equation. It immediately lowers prices and sets the tone that your not a "laydown Larry/whale/Sucker".
Thrid: Do your home work. Find what the market is pricing like vehicles. There is a wealth of sites out there to help you. kbb.com nada.com edmunds.com almost all used cars are marked up at least $3000(min). I like ebay's "completed" auctions.
Fourth:Be nice, but be indifferent. Don't give away any more info than neccessary.
Fifth: Never ever buy the first day. Let the salesperson know you are shopping for the best price, and will make your choice within 2 weeks.

PS, In your case(cash buyer), a dealer would be stupid not to "try" to earn your business. Fill out one of those forms on line that let dealers contact you with their lowest prices. Most dealers will be happy to give you a super deal, especially if your not in their market. Your dealer will still be happy to service your car, as sales and service are two seperate entities.