Hi,
I'm experienced with FMS, Wowza and Red 5 for video streaming and I can definitely help you migrate. I can't tell yet how many hours it will take me, it could be anywhere between 10 to 40 hours, but I will need a description of the site, number of visitors and how they access the videos. I'll also need to know if you host the FMS server yourselves or have a shared instance.
Thanks,
George