Design: Logo, business card, letterhead etc.

Hi, We are a new company called 'Businessware' and We will specialise in cloud computing services, internet services and software development, everything focused for other companies (B2B). So we are looking for a logo designer to come up with something original and stylish for the business. At the moment we have clean idea of web site design, but nothing more. Project shoud cover design of - company logo, colored + b&w - business card - letterhead A4 - product list A4 (with services description and some business pictures) - stamp - promotion boards A4 (for contract etc.) - car stickers (logo, company name, motto) I will only pay until I am 100% satisfied and will not release any initial payment until I am happy, the reasons are that Ive had some bad experiences on freelancer and that is why I wont release any payment until it ii finished. Please send a portfolio of your work as well as proposals for the logo.