You can use Sinar, Hasselblad/Imacon (Ixpress, CF), and phase backs on the Rollei 6008 integral and integral 2, and 6008 AF. The phase backs require a resister added to all but the newest 6008 AF bodies. This is to keep the back awake. I don't know if the phase backs will work with the integral 1, but I understand the i2 can be modified. But there are a fair number of options for digital backs. Phase is just more expensive since they charge a big fee for the mount change and only seem interested in doing it with a new back.
The prices on the lenses seem great - good luck with your sale.