LAST EDITED ON Feb-06-06 AT 07:55AM (MST)[p]I just went through this myself.
Here is what I decided. Taking into account cost, function with a rifle, and quality, go with the Leica 900. The Japanese brands and Bushnell do not work far enough out for rifle use. Maybe the Bushnell 1200, or whatever it is does, but now you are getting close enough to the Leica price to justify the extra cost for the German brand. Looking through the Nikon was like looking into a manhole. It is way too dark and the glass is cheap in comparison to Leica.
Leupold has the new rangefinder/ ballistic kind. I do not know what they cost or anything, but they may be worth a look.
I have not played with my Leica much but I can tell you I have ranged a horse at 512 yards, a portable outhouse at 630 something, and a metal building at 1215 yards. It seems to live up to it's claims and I would call this rangefinder "good." They are sold for a minimum price of $499. Anything more is a rip-off.
Also, don't be fooled by the yardage claims. For deer sized game you can divide the claim by two to get the actual yardage they are good for. Nikon 400 = 200 yards. Leica 900 = 450 yards.