Look up a company called Bokeh Inc. (Seebokeh.com) They have a great website, and a pretty impressive list of clients considering they are a start-up themselves. They have also worked with Y-Combinators before like Watsi and Caviar.
Look up Bokeh Inc. (Seebokeh.com) They have a strong list of company's whom they have worked with and tend to understand start-ups extremely well (as they are a start-up themselves).