If there was a back out there that could shoot 1600-3200 ISO full sensor and no moiré I would buy one.
Phase One P65+, IQ160, and especially the IQ180 meet all three requirements.
IQ180 with 5.2 micron sensor is very unlikely to show moire (I never say something like moire proof since even a Canon with a strong AA filter or the human eye can see moire), is full 645 frame and can shoot up to ISO3200. The P65+/IQ160 does so at 15mp with final print detail in a 4:3 image comperable to a 5DII. The IQ180 does so at 20mp, but we have not done direct comparisons to other cameras.
I'm considering that legally binding :-) and will expect your order Monday for one of each.
From the road