Data Visualisation Websites

I'm looking for an experienced web developer to help me create a series of engaging, interactive, web based data visualisations. I will provide the data and a spec showing what I'm after, but I want someone with creative ability to think outside of the box too. The specs will not be thorough. D3 and SVG experience is an absolute must, as is solid html5, js and css. I have a large pipeline of work and I'm looking for someone to form a lasting partnership with, across multiple projects. I am an experienced developer and I will be reviewing solutions and contributing to the code, so no time wasters please... We will start with a fairly small, trivial, project as a trial run before moving onto much bigger projects. I would like to see a portfolio of your recent work and clear evidence of your D3 experience.