The most indestructo carbon forks would have to either be my AlphaQ X2's or the Wound-Ups.
You're right though, a pound makes absolutely no difference. You want a steel frame and forks? I say go for it, but not because they're less failure prone, but because they're customisable, ride really nice and look even better.
If we all ran scared when something broke, none of us would be riding.