Since no-one has replied I will.
If there is a hobby shop close to where you live then that is your best source of infomation.
The next thing you can do is pick up a RC Car Action magazine. In there you will find all the good cars and engines you can choose from.
If you're looking to start close to the top my only advice is stay away from any Ready To Run models. Not that they are junk is just that a kit version will have better parts and good hop-ups are generally included.