The Leica, or a Leica... lots of Leica on the market..
Not that I have an answer for you.. I have a m3z, which I love, and an mz6, which I also love... I'm really curios about the new Leica, which have one small eyehole which increases your depth of field.. that sounds pretty slick..
I tried Leica A60 (I guess it was with 0,5 objective lens) at GRS classes couple of months ago - it is amasing! One can literally see all the working surface (even if it is a ring or bracelet), and the ball vice and also the top of your graver - no need to adjust hight of the scope every time or worry if you tilt the vice and everything got blurry...
You absolutely have to try it))