Joe: I say lose the 4m and get the 4a. You'll have a more seamless transition between the 4a and ZI, and this, to me, isn't a small point when you find yourself "in the zone", photographically speaking, and this would encourage frequent use. Since full-manual control (metered!) is always there, you can use it where and when it makes sense; AE isn't evil, folks.
I've gone back and forth a bit on this, but if I were to get a non-motorized body to work with my pair of Hexar RFs, it would likely have AE; the ZI is the frontrunner here so far, but an R4a and its superwide capabilities becomes more tempting with time, and at a reasonable price.
And, finally: would I be mistaken in thinking that the 4a would have at least a slightly more-quiet shutter than the 4m (unless Cosina has done away with the "twin" shutter system used on earlier non-electronic Rs)?
- Barrett