Pierre -
If you haven't already..
You should check out domainsbot.com or justdropped.com.
You can enter the key words you have in mind for your domain name(s) and see domains that have or are about to expire that contain your key words. I've got some great domain names that way.

I think yahoo still has $2.99 domain registration going on so you it's cheap to stock up if you find some you like.

Hope that helps a bit.

Best Regards, cj