I have the Planet Bike Freddy Fenders on my NWT. I'm pretty happy with them. They cost about $35 plus shipping. The Freddy Fenders have stays, which the ones on the BF site don't seem to have.
I haven't actually traveled with my NWT (yet), but to get the bike to fit into the suitcase, I expect to have to take the fenders off. I can't see how I could make the bike fit without doing that.
What model are you waiting for, and more importantly, what color will it be?
Speedo