The Steamroller is nice but for hard core commuting I might go for a Bianchi San Jose instead. It has aj extra set of bottle bosses, rack and fender eyelets, canti bosses, massive tire clearance and overall it's just an awesome versatile frame. You can use it for fixed touring, fixed road riding, fixed cyclocross and of course fixed commuting.

OK, truth be told, I would buy a Bianchi Volpe frame and run it as a fixed---it's exactly the same as the San Jose, but with forward facing horizontal dropouts and a derailer hanger. Maybe you would prefer track ends for aesthetic reasons, but i really appreciate how much easier wheel changes are with horizontal drops, particularly when running fenders. And it makes sense to retain the option to gear up your bike somewhere down the road. The cross check has similar versatility and awesomeness if you're set on surly.