Folks on these boards have mentioned Velocity rims. If you're going to have a shop build up a wheel for you, you might ask to see what they use. You can also have an online seller build up a wheel for you... Gaerlan, Harris Cyclery and Peter White come to mind.
I've never built one nor have I had one built for me so I can't add anything beyond the above... which has been mentioned elsewhere on this forum.
--sam