#1 Arsenal (2003/2004)

An obvious choice for number one, Arsenal's finest ever campaign ended with them unbeaten, earning the moniker 'The Invincibles'. Many in the media thought that Pep Guardiola's Manchester City side could repeat the feat this season but it wasn't to be after their 4-0 hammering by Liverpool last week; that should tell one all they need to know about the impressiveness of Arsenals achievement.
Arsene Wenger had built a beautiful and formidable side in his first 8 years in London and this league win was the icing on the cake. There were no weaknesses to the side whatsoever. Sol Campbell and Martin Keown led from defense, Gilberto Silva was a calming presence in front of them in the midfield.
It was the flair players who ultimately defined the team's season though: the combination of Thierry Henry and Dennis Bergkamp perhaps has no equal in Premier League history, with the speed and trickery of the Frenchman perfectly balanced by Bergkamp's coolness and vision. They combined for an amazing 34 goals that season, mostly laid on by the Dutch master to his striker partner.
Arsenal faced many tough challenges during their campaign, obviously, and it looked like their unbeaten run would be ruined numerous times, but they always managed to get at least a draw.
Unbeaten seasons would happen all the time if they were easy, as opposition fans like to claim in retaliation, but they happen so rarely in football that they just have to be commended and praised when they do happen. Arsene Wenger and his men will be immortals forever to Arsenal fans and neutrals alike.