Creating a professional image is doing the small things right. Throughout my career we used a channel lock binding system to create hard cover presentations. ChannelBind is the best company on the market today. After you purchase your binding machine you can baind as many covers as you desire. We had the cover embossed with "Confidential" and our contact information so we could use them for any type of presentation.
The website includes a video that explains how the system works. This will separate you from the herd.