What is more interesting ?
1- Use a Tvix as a "video" center to store DVD and Blu-Ray and let the BS5/BM5 act as a music center
2- Use the BS5/BM5 as a fully MediaCenter with videos, photos and music stored but maybe with the risk of "overload"
The Tivx reads .iso files and it's apparently easy to rip a DVD and store it to the Tivx.
Rip a DVD with handbrake and get a .wmv file could be OK too.
So, what is the wisest decision ?