I have no experience with the new Nikon Buckmaster ( I have heard they improved them) the new ones are supposed to be brighter. The old Nikon Buckmaster was about the same as the Bushnell 3200 as far as brightness and clarity.
Bushnell has the rain guard so if you hunt in areas where you get a lot of rain. The Bushnell also offers the firefly option. If you use a bright flashlight the cross hairs will glow bright for quite awhile.
I would bet that the new Nikon Buckmaster will be a brighter scope since that was one area they claimed to improve upon.
If I had could make a few suggestions I'd definitly check out the Burris Full Field. I personally liked the optics better than either the Nikon Buckmaster (older vesion) or the Bushnell 3200.
Also, its a personal thing for me but I have never seen that much of an advantage of going to a 50mm objective, just more weight to carry. I have not found that much of a difference in light gathering abilities to warrant the extra weight and the higher mounts.
If you want to spend just a little more money I'd definitly check out the Weaver Grand Slam. Its a little more cash but I think the optics on it are quite a bit better than any of the ones mentioned above.
Edited by Acenturian