Join Date: Feb 2008
Bikes: 2012 Cannondale CAADX 105; Wabi Classic Fixed Gear
Nothing wrong with those 2 bikes, but with that budget I'd check out craigslist or bikesdirect.
Though I don't currently ride one, I've owned 2 Kilo TT's from bikesdirect, and found no better for the price. You're getting mid-high end name brand steel tubing for the same price you'd get a tank elsewhere. In my opinion they're much nicer looking frames than Pure Fix or Torker, and don't waste your money on cheezy (and HEAVY) knock off deep V's.
Keep in mind you'll probably replace your saddle, pedals, and possibly bars and stem on most bikes in that price range. The Kilo's have decent enough wheels and crankset to last you a while though.
I don't think this is necessarily the case with Pure Fix or Torker, but sometimes these companies that specialize in entry-level bikes use really weird non-standard component specs that make them difficult to upgrade - look into this.