http://sheldonbrown.com/rinard/spocalc.xls has measurements of many Araya ADX rims. Some of Araya's pages have ERDs, not all.

A search of this forum will find many people who build their own wheels who have mis-measured their ERDs. I have. I suspect only Mr FBinNY and a few others can build a wheel in an hour, especially the first time. I take 3-5 and once discovered that my spokes were a mm too long only when finishing, which meant I had to unlace, buy new spokes, do it again. You face the same prospect. Nothing anyone says anywhere can guarantee that you won't have wasted the time and money of building a wheel with wrong-length spokes. I've been in the LBS when a guy brought his bike in to have a flat repaired. We choose how to live our lives.

Don't take people's responses personally. Take what you can use and ignore the rest. There's a lot of great advice here, all of it free, except for the occasional hard feelings.