burris. i only own burris scopes. the BDC idea was in use by burris long before nikon rubbed elbows with t/c. watch out for the long eye relief on the nikon, it limits you FOV bigtime. also if you plan on taking off you scope to use the iron sights you might not be able to keep your rear sight on if your using the nikon cause you have to move it so far up that your rear sight will be in the way. I've installed them on pro hunters and have had to take off the sights.
i don't like the QD idea. to me it just seems that it'd have to move your POI. I'd use burris sig zee rings.