So... you're looking for someone else to do the only difficult part of the application for you?  The part that is specifically designed to test how you can express yourself and your academic ambitions?  

Good luck dawg.  

Approach it like a love letter, passionate, poetic, and authentic. If you find yourself struggling beyond normal writing processes, you should probably question whether you're cut out for the program you are applying to. 

All that being said, I agree with Non Sequitur; it's like presenting in a design review, you're supposedly the expert here. Anything other than your gut feeling is likely irrelevant.