My nomination is for Warhammer fantasy role playing 1st edition
The system - This is the anti munchkin game, there are not tons of weapon stats and the emphasis is heavily on RPing. You can play anything from a lowly rat catcher to a city guard, bounty hunter to more heroic classes. Combat is deadly one or two hits can kill anyone, your PC's really have to think before attacking that band goblins as one lucky hit and they will go down. The system is designed that the players can try anything with skills adding a bonus. The system is about good narrative and not number crunching.
First edition is pretty much a complete game in one book, the bestiary is complete and allows the GM to modify each entries stats, and add skills (the entries are not designed to only be used as is)
The background - This is the Warhammer world from the late 80's, before a lot of silliness crept in. The theme is very much that man will sow the seeds for his own destruction, Orcs are not mushrooms, Bretonnia is more pre-revolutionary France, rather than a poor Arthurian rip off. The plots are more investigative in nature and about uncovering conspiracies rather than straight good vs evil. There is enough background to start off with and plenty of blank areas, to develop.
Published books - No mention of 1st edition is complete without including the enemy within campaign. This is one of the best pre published campaigns. Like a lot of pre published campaigns it needs tweaking to suit the players style, and I change a few elements of encounters and develop plot lines myself but there are real gems here. Shadows over Bogenhaffen is the best scenario for new players ever written IMO. Death on the Reich gives the PCs a huge amount of freedom to explore. Power behind the throne is just awesome, its a lot of work to GM but hugely rewarding. It does fall down a bit with Something rotten in Kislev (written by the way by Ken Rolston), its not all bad but some feel it doesn't fit in and is best used outside of the enemy within, and some see Empire in Flames as a bit anti climatic but I found that it works well with some tweaking. The hogshead books are mostly collections of reprints but their source book Marineburg-sold down the river is considered the best city source book there is and I agree, this and the main rulebook will keep your group busy (in fact some when running the enemy within send the PCs here instead of Kislev).
Everything I need out of a fantasy RPG WFRPv1 delvers I don't need any other system for fantasy, the system is elegant and allows the GM room to maneuver, the background is excellent and the pre published campaigns and adventures are better then most offers from other games.