Going to WordCamp Paris & testing WordPress-MU 1.5-RC1

I’m going to the first WordCamp (WordPress meets BarCamp) in Paris this Saturday. I’m primarily interested in evaluating a wordpress-mu install for Jamendo and I hope to find some advice there ;-)

To become familiar with MU I’m currently trying the latest release candidate which is synced with the wordpress 2.5 tree.

I’m wondering what would be the best choice for the blog URLs:

The real question behind this choice is: what’s the right tradeoff between security and integration into Jamendo?