I am 5'-3" and ride a Wabi Lightning 42cm c-c frame with 650c wheels, however, I suspect the cost would be more than you'd want to pay. I think your best bet would be something like the $300 Motobecane Messenger singlespeed from bikesdirect, which comes in a 43cm size with a sloping top tube and 700c wheels. This is what it looks like in mine, which is highly modified. I've got mine setup as fixed with no rear brake, however, stock it is setup as singlespeed with front and rear brakes. The only change you'll want to make is to swap out the 16T freewheel for a 18T or even larger.