I'd just build one up on the cheap, but I guess that's my way. Even if you don't want to build anything, you could get a road bike and a new rear wheel for cheaper than the Steamroller or the Pista. It would have character, too. Also, if you don't like it, you could just put the old components back on and have it as a beater.

Just about everyone here absolutely loves fixed gear, but you may not. Honestly, I would try it first before getting your Surly dream machine.