Can't get much better than this other than having a Gen II Xr ret IMHO </div></div>
+1
Or the NF that you refer to in your post. There is a regular supply of NF scopes for sale here used. I assume that you have already budgeted for spotting scope, binoculars, rangefinder, ballistic software, kestrel, etc. etc, $$, etc.
Just make sure it has a good warranty and is rated for use with a .50cal. Those Thumpers bang the shit out of a scope! I wrecked a few with my Barrett!
Edited to add: They weren't NightForce scopes that mine wrecked. I have the utmost respect for NightForce!