I love PDF's. They open on just about every computer. They slide through the spam filters and they can offer a professional presentation. I recommend each and every ISM have a way of saving a document/price quote in PDF format.
Jeff, I can say that by providing price quotes to our customers, we get more traffic from the internet. However, that is followed up my very aggressive phone call follow-up.
But, the PDF idea is great. Currently, we download window stickers to PDF and attach them to our quotes, but being able to send the entire quote in a PDF might be a great idea.
Alex, I agree a bunch of random graphics is not something that is beneficial. Currently my template looks more like a 2 column webpage with links on the left of the quote to take them to various landing pages on our website and a header to brand our dealership. Inside the body of the email gives them the quote, disclaimer, and some information about our dealership.
Rob, I agree, the SPAM issue seems to be the biggest detractor for using graphics. In response to that problem, I do have my auto-response go out in all text, and in the body of the email in bold red letters, I remind my customers that they should check their SPAM folder if they do not receive my quote within a certain period of time. I have found that people do see that line and have confirmed they received my quote in their SPAM folder because they looked for it.
I think that by asking the question, and responding to everyone's excellent observations, that I do actually like quote template I am using. However, if it becomes cumbersome to continue to implement due to SPAM issues, I have no problem going back to a text only quote.