Using Fiber With HD TVI/CVI Cameras? System Recommendations?

I have never messed with any of this stuff, but I think I have a project that might be suited for it now. We have a client with an older Pelco/Bosch analog system and the DVR's are finally starting to wet the bed. The building is a very complicated multi-story thing and replacing cables would be an utter nightmare that would triple the budget. I would like to propose some sort of HD coax system but I know for a fact that 4 of the roof mounted cameras are using fiber to get back to the head end. What are my options to utilize this existing fiber in an HD TVI/CVI application?

On top of that, I am looking for recommendations for systems you have used that you would recommend. The current system has been there 11 years, with virtually no maintenance. That means whatever I put in needs to be durable as I expect it to be there for a similar amount of time. Of course I am offering maintenance support with my install, but durability matters to these folks.

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