If you think, you will have your car for a while, pay a little more to get a few more options. In the long run, it will benefit you to have what you want. If you don't, you may add on later and pay even more money. For example, getting a navigation system included will generally cost you less than picking one up in the future. Did you know that the EPA levies a tax against cars which have a miles per gallon rating of less than 21.5? This could be as much as $7,700 per year for the worst offenders! Find out whether or not the car you buy will be taxed before you buy it.