Finally got ceph up and running, so far it does look really great!
At the moment we have 45 TB in the cluster, but we are able to expand it extremely easy.

Two servers with 256 GB RAM and 24 cores, three more with 32 GB and 12 cores.
Dedicated gigabit WAN connection.

The project is going forward strong, I'll let you know when it is time for beta testing.