Corporate Logo Needed...

Hello, I have a new company that manufacturers Printed Circuit Boards (PCB). This is a high tech field so the logo needs a high tech look. It needs to be clean and exact lines, electronic engineers are my primary target customer. I will require unlimited revisions until the logo is finalized. It should be delivered in vector format, done in Photoshop, illustrator or similar and of course I retain all rights to the logo after final payment. I will need to see a portfolio before I select a bid. More information is available for selected bidders. Thank you.