My first M-series was an M3 and I had a 35mm Summicron with googles for it - and because of the googles my goal was a .72 finder which I got a short time later in an M2.
The googles make an awkward lens, both in handling and view, make a lens heavier then needed, and an odd size when off the camera to put somewhere.
If you plan to use the 35mm more than occasionally the in camera .72 finder is the best way to go. In fact I like the 50mm frame in the .72 finder better too, easier to see the whole frame at a glance, with the M3's .92 finder you really need to roam the outside of the 50mm frame to see what's there, but with the 90mm lens the M3 comes into its own.