This is one of those things where I think you need to do your homework and then hope for the best. Hassies either seem to break or the don't, so you get some varied answers. Also, Phase dealers seem to have different answers to the question than Hassy reps. From what I have seen, the body shutter is good for about 100,000 and then you are on borrowed time. Some last forever, but most that I have seen seem to go in the 100k - 150k exposure range. I think replacement is about $1,500 USD. There are a couple lenses that seem to need shutter replacement more than others. I think it was the 100/2.2 that was more prone to issues. This info is second hand from someone who managed a rental house, so they may have been used harder than average. The photographers I know who have them dumped the system at the first sign of trouble, or used Canons for shoots that would stress the cameras (weather, etc.).
All this to say, ask a lot of people, look for the similarities and ignore the outliers. I'm in a similar boat, but looking at a H3DII-39, or going the H2/Phase route.