Logo design for website

We want a fairly simple logo design for our website but it has to be unique and not copied. Something like the logo of Foursquare, Mint etc, where the name is the logo but in a beautiful way. Something in the concept of these site logos and not copy. We want it in most available formats, in high resolution and we want to be able to add sublogo for each section of our site. We require a selection of at least 6 logos to choose from after you've been awarded the project. We will pay only after completion of the process, no advances and no milestone payments. The name of the company will be given to you after the end of bidding process.