I have played many GTA's, and I will rank them in my opinion.
GTA V will be the biggest GTA and the best game of 2013. The game had to be late developed because it was so good. The game includes locations and stuff that the other GTA's will not have. The City is San Andrea's Los Santos but bigger and in a different shape. There is a gameplay video, but it is not the real gameplay, but an example. see more on Grand Theft Auto V
GTA San Andreas is not the most recant it was developed in 2004. It has the biggest GTA map until GTA V. The graphics may not be the best, but you can do more stuff than GTA IV. You can drive planes, trains and build your body and also lowride. The map includes Los Santos (Also in GTA V) that is based on LA. Las Venturas that is based on Las Vegas and San Fierro that is based on San Francisco. It was worth paying 1200Mspoints. see more on Grand Theft Auto: San Andreas
GTA IV is the most recant official. There are two Liberty Cities. One custum (GTA III) and one based on New york that is this game's. GTA IV has the best grapics than the other GTA's. ON GTA IV, you play as Nico, who is a Russian Veteran who moves in near his cousin Roman. The game includes. The Underground, and also TV :D see more on Grand Theft Auto IV