TL;DR_ Your proposal is usually the first real thing a client gets from you. For most of us it's a simple PDF, and a PDF can make good work look cheap. Turn the proposal into a fully branded interactive web page instead, and give your clients the ability to build the quote for themselves. You look like a much larger business with real systems, and instantly stand out in an inbox full of attachments. And even better - a client that plays a part in the creation of their quote will nearly always...