business card and corporate identity

We need to design Business card ( both sided ) , letter head , envelopes ( small and A4 ) and Invoice design. The logo is ready but needs a bit of brushing. Freelancer will be required to submit at least 4 Business card and 4 Letter head designs. Important Note : We will award the project but will not create any milestones till we like the business card and letter pad design. Once we like the business card and letter pad design , we will create 50% milestone and final 50% after completion of complete work. The payment will be released only after completion of the whole job. We reserve the right to leave the job if the designs are not found satisfactory , without paying a milestone.