Now that I have a couple of sales in the pipe here I can start giving ideas.
We need something along the lines of a link button saying "transaction conversation" for a direct contact to send a message to our buyers without having to fish our way only to eventually finding by searching the members name is the only way to start a conversation about the transaction. Very useful if your buyer does not have the initiative to start a conversation. I think the button idea would be good for both. Another idea is an independent order form attached when someone hits a committed buy link that we also could use. You've shopped on that other music site before? If so, they have a good method for buying and selling IMO.