To get Donkey Kong to work properly, there is a small in-depth guide (link below) to get the game going:
http://www.emutalk.net/showthread.php?t=17897
You can use Jabo's audio, but you must use the RSP plugin that comes with PJ64 to get it to work. Simply copy it to 1964's plugin folder and enable it. Definitely worth it!
Yep, Rice's does have problems with Radeons, but there are plugins that work great on them such as Jabo's, glN64() and Glide64 + eVoodoo. Hopefully Rice can fix the Radeon complications soon!