The V8000 can be used with a BL1000. Remember that every command is passed through the scart connection from the tv. The V8000 will actually give a different menu if connected to a BV7 compared to an Avant.
The V6000 can be used, but i doubt the PIP-function can be used in this combo (V6k+MX7k) - which is a minor drawback (if any).
Roger