I had a Masi fixed gear commuter, long wheelbase like a touring bike, that I used to love... it got stolen. Couldn't find another like it at all, and settled for a Trek District fixed gear.
And now I like the District even more than I did the Masi. It's zippy and solid and great for urban use - riding off curbs eg (which I do all the time). The riding position is more upright which is also nice for traffic. Doesn't ride good no-hands though, maybe because of the high bottom bracket.