Logo/Graphics Pack Design

We are new UK based VoIP provider looking for a corporate identity from a professional designer. We need the following criteria to be considered, and a full spec sheet will be provided to the winning bidder. * The design must be high quality, ORIGINAL and professional. * The design must be simple and clean. * Bidders must provide a link to existing portfolio. * Design copyright will be released to our company. * Mock-ups will be required. * Vector format (such as CorelDraw) as well as BMP, JPEG, PNG and GIF need to be provided. * As the name is not fully decided we need to look at the ability of easily changing this at a later date. I have included a logo which I have designed and like, we would like this logo to be considered using other fonts, colours and we would like to do something more 'creative' with the circle concept. The winning bidder will recieve work in the future for other graphics such as letterheads, cards and templates and these should follow soon after the logo design