Sinar eMotion backs and Hasselblad CF backs (iirc) are the main choices. I would recommend the Sinar partly because if you upgrade your 6008 to a Hy6, you can just swap adapters and use the same back.
Don't know why you say "main" though both of those are good options.
You can order any Phase One P or P+ digital back including the P65+ in a Rollei 6008 mount. I think it's a great combo.
It is something of a special order item but most of the larger dealers (including us) have experience with this platform and it is no trouble at all.
Doug Peterson
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Head of Technical Services, Capture Integration
Phase One, Canon, Apple, Profoto, Eizo & More
National: 877.217.9870 | Cell: 740.707.2183
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