I have to agree with Ross and Dave. Another vote here for a spacefame.
Although it depends whether you can do the repairs yourself. If you can't, then with either spaceframe or mono, you just have to throw money at it and consequently the consideration becomes how much, and how important is the down time.
I wouldn't want a mono or a tub unless I could afford to have a spare one sitting in the workshop. That is unless I had the supplier virtually on my doorstep and they had guaranteed to supply one from stock instantly, should it be needed. Still a lot of work changing everything over though, not to mention the dollars involved. Either way, with serious damage you may need to do a fairly comprehensive strip out anyway.
Of course there's always the old adage "it won't happen to me". This is a very comforting thought and one that I find most assuring!