After much searching I finally gave up on finding a high quality .rm file to convert to avi. I did find a few mediocre ones, and converted to avi with SUPER with little change in quality. Real media video pretty much sucks, if what I found is typical.
I used an avi container, xvid codec, and top quality setting in the video options of SUPER. You can also increase bitrate to try to improve the quality of the conversion.