We had great success on microburst.com. To improve your chances on getting a good result review previous work from designers and invite those designer's to participate in your contest, then give them regular feedback concerning what you do and don't like. These folks are designers not mind readers. Also don't expect a $500 - $600 design for $195. Be willing to pay the winner fairly for their time. I recommend that you invite "artsie9324" to get designs you can be proud of!