a standard matte black 6" d.e. in great condition runs in the $850 range here.
as to the other points raised... it is not what i would choose for a defensive pistol for mountain lions, though it is a superb choice for hunting. it is a big, heavy, powerful gun. it is not maintenance intensive nor is it difficult to clean. if you still buy factory ammo, 50 ae ammo is available to me for $22.26 locally. since i am a handloader, this doesn't mean much to me, but finding component bullets typically means another order to grafs because locally the only 50 cal bullets available are for the smith 500 (350 grain bullets). accuracy of the gun is pretty typical of handguns. i don't think it shoots any better or worse than my other hunting handguns. the issue sights on the gun are fantastic - unfortunately mine came w/ a 250 or so yard zero. to remedy that i put a red dot on mine. i suppose if i was more patient or cared enough i could've filed the rear sight or replaced the sights, but i wanted a dot.
i use mine for big game hunting, and it is excellent in that role.
there are 2 issues with a d.e. that i wish could be fixed: 1 - it gets way too much attention at the range. best to shoot this gun when others aren't around, or when the guys that are there are the anti-social guys. otherwise you won't be left alone until you let everybody shoot it. 2 - the grip is very 'long' - you need to have long fingers or very large hands to operate the gun well.