Jazn,
Ray Paul of SL Classics has a great reputation. However, my experience with him via Fax and Email mirrored yours--but that was several years ago when he was at Star. When I called him last year, he was prompt and courteous, and the part arrived quickly. So some methods of dealing with some people are better then others.
What I found is that many people don't like getting long lists of parts, for which they need to do some research, check their price and availability, then get back to you. I would imagine that some could spend all day doing this, and not sell anything! Just ask Dr. Benz. Better yet, email him the list and see how quickly he responds!
That being said, I preferred the fax and email because it allows ME to ignore time zones and do what I want, when I want; it allows the recipient to take some time and go through the list.
If you'd like a word of advice, sometimes it is better to use a fax then an email; at least in most cases they get a piece of paper. It is always best to follow up with a phone call--tell them you are sending (or have sent) a parts list and want to discuss it with them. If you sent an email 2 weeks ago and have not called them, IF they got the email, they probably don't think you are too serious else you'd at least have called them, right??
I made a post some months back on this. Those that treated my inquiries seriously were the ones that got the business.
Michael Salemi
1969 280SL
Signal Red w/Black Leather
Restored