if it needs to be a MS camera you only have choice from 2 brands. One of them doesn't have a screen on its MS back and no option for carrying a battery making it less suitable to use in single shot mode on a MF body.
Your best option IMO is one of the HB MS backs. Anything older than a H3d39MS will not make use of DAC.
If you really need MS I would look for any of these CF39MS, H3D39MS (or H3DII/H4) or a H3/4/5 50 MS.