You say you want a mildot, are you planning on doing any ranging or just for holdover?
The scopes you mentioned are all SFP reticles making ranging much more difficult at intermediate zoom settings. Will you be doing a lot of different distances, running the elevation up and down? Maybe you need to consider a scope with a zero-stop option to avoid mistakes, especially if you want to compete in a match.
IMO 3-15 is plenty to go 1000 yds. 20 or 22x gives a smaller field of view making it harder to find targets without having to constantly run the zoom. Consider for a given objective size (50mm for example) higher zoom means the exit pupil is smaller that can cause low-light performance issues.
I would consider the Nightforce the best of the scopes you mentioned. Better features, optical quality and customer service. They also have less expensive models.
Leupold is resting on their reputations and not the same product or CS they used to have.
I don't have much experience or info on the Ziess products at the price range but I would assume it is good quality (does it have enough elevation adjustment for 1000 yds?).
I can't recommend Burris right now, too many quality and CS issues. I like my Nikons but I think there are better products for your needs. Before either of those I'd look at the Bushnell Elite Tacticals, while I don't have personal experience, I hear good things and they seem like good values.
IOR Valdada was mentioned and is worth looking at, it would be my choice for "best value" in your price range. Solidly built, great features and glass for the price. In the past quality was an issue but that is not a problem lately. Check out the MP8 dot reticle ... good stuff.
How about Vortex? They have been building optics for quite a while and are coming on strong in riflescopes. The PST series might be a good option and will be less than $1k loaded. Jump up to the $2k mark and the Razor HD is a great scope.
Truly "high end" scopes are 2-3 times the price range listed. Hensoldt, Schmidt & Bender, Premier Reticle, US Optics can be purchased starting around $2000 and go up from there, they have the highest quality glass, features and a lifetime warranty (some of the lower priced also offer lifetime) It really depends on what you want/need ... budgets have a funny way of "expanding" when you see the differences..... buy once, cry once
After a lot of comparisons I have a PR Heritage 3-15x50 coming for my LR rifle, I'll be shooting it out to 1000 yds in competition and so for me it was worth the $$ (ok.. the $$$$
Midway is good dealer but shop around. Many of the dealers are willing to sell below the listed prices so better deals can be found if you call the right place.
Call Scott at Liberty Optics
and tell him what you are looking for he will give you great insight, advice/recomendations and
I also recommend SWFA