i went for no. 3 when faced with these choices myself i did last a couple of years but eventually the TV tube aesthetic lost. from the gold-sprayed condenser heaven i fell onto the canadian clunker... and my pictures did not suffer one whit
incidentally, i looked into the M3 at a camera show this morning--i laughed, no, no going back, death to TV tube!
The M3 eyepiece rounded corners are reverence to the Ur Leica and visual culture of those days. 739px-Ur_Leica.jpg
The front is rectangular but eyepiece is circular and kinda crops the corners when You look thru, its a feature that many other legendary cameras have.