I most prefer 38. Still like to see an even more classic font for the jd. And I'd love to see the option of grey for the majority, with blue for "studio?"
Check out my signature on the paintings on my site/blog if you haven't already. It may give you a good idea of a font to use. It's very straight up and down, no real slant to the letters. I really love the idea of having a (I don't know the technical term) "stamp" separate from my name like we have going. I think I like it on the left, too. My gut is that I'd like it to be not solid--meaning a transparent? background, outlined, with the letter "j" or "jd".
Or, what about all the info inside a box? Just brainstorming.