Thanks again, everyone. I really appreciate all of the advice and the links to other rides.
Tenere89, thanks for the info on the Gudvangen ferry. Luckily, I already changed my mind and decided to do the ferry from Gudvangen to Flam (yeah, I'm a tourist) -- and I made sure to confirm that they'll take the motorcycle on board. From Flam I'll be riding the Aurland road to Laerdal.
I looked at Tindevegen.no. It's gorgeous. I probably won't decide on a route until I leave Laerdal.
Lars, I haven't yet decided how I'll be getting to Kristiansand, but I'm leaning towards the Jaeren route. I'll PM you if I decide to go that way. I hope all is well in SA!