If thats how your doing it then the only difference to buying private is a dealer is charging a few thou on top to make his cut.
Sorry if I sound like a fool, but I would rather buy a private car from someone off these forums or out of the trader who has serviced it properly every 5 thousand K's etc then some f**kwit dealer only interested in making a buck, they don't care what condition the car is in. Why would they? all I'm saying is there is a lot of time bombs out there, be careful what you buy.