Wow. Bummer about the wheel.
Do you have the Mavic MP3 protection plan on the wheel? (don't know if it applies to custom built wheels, however) I got a 3-year plan with my wheels that (according to the LBS guy) would fix or replace the wheel even if damaged through a pothole or parallel grate accident. I don't recall the specifics of the program, but I'm sure the Mavic site has some info.
Also..since it's your front wheel, running the chain on a different cassette wouldn't be an issue...so would your LBS be able to loan you a wheel if it takes a while to repair yours? Might be worth asking.
I can't say I've broken more than one spoke in the past 10 years. I did wreck the rim of my rear wheel on my old Seven (a Shimano Ultegra wheel) in a parallel grate. That was a pain.