The Wonder Year
It was an easy pick for me - 1996.
I was in London at a time when the whole 'Cool Britannia' thing was exploding. It was the place to live. Britpop was huge, the country was getting behind its football team for Euro 96 (arguably England's last decent tournament performance) and - at least from where I was standing - the city was a vibrant, optimistic place to be. On a personal level I was doing a job that I was not only pretty good at but also enjoyed immensely, I was still young enough for most of my pay to be going on entertainment rather than 'responsible' expenditure and I'd just met the woman I'd eventually marry.
Certainly time will have given it a rosier hue, but even taking that into account it takes some beating for a single 12 month period.
So yes, 1996 for me please. How about you?