You'll need to be more specific than that. What are you planning to use the scope for? What firearm are you installing it on? What power do you need? Do you want variable power or fixed power? What eye relief do you need? Are you shooting in low-light conditions? Do you need a 1" tube or a 30mm tube? What size objective lens do you need (or will fit your application)? What range will you be shooting at? Do you need to make quick windage/elevation adjustments? Do you need 1/4 MOA, 1/2 MOA or 1 MOA adjustments. What reticle do you want/need? Do you need an illuminated reticle?
As in most things in life, you get what you pay for. I'm sure you've heard of the law of diminishing returns. That's true for most things in life too. For some people, knowing that they have the best available is important to them. For others it's not. I once read that a good rule of thumb is to spend equal to or greater than 50% of the cost of the firearm on the optics. The point was, don't mount a $100 scope on a $1000 rifle. So what are you getting when you pay $800 for a scope (say 3 - 9X with 40mm obj.) compared to a scope that costs $200. Hopefully you're paying for quality, clarity, consistency and reliability. Quality refers to the materials that the scope is made from and the tolerances maintained. This includes the aluminum tube (thickness, alloy, manufacturing process, internal/external dimensions, runout), the internal parts other than the glass which may be aluminum, steel, brass etc., the o-rings, inert gas, and so on. Clarity refers to the quality of the glass, the coatings on the glass, the size of the main tube, size of the objective lens (affects function in low light conditions). Consistency refers to how well the scope performs in different conditions both external and internal. Does the POI change when changing from 3x to 9x? Does temperature (differences in the CoTE of the internal/external parts), humidity, vibration effect the POI? Reliability refers to the scopes ability to continue to do what it's supposed to do. Will it still perform well after four or five years of range and hunting use? What kind of warranty comes with the scope?
Well, a long-winded response but it should give you some things to think about so that you can rephrase the question.
Personally, I have five Leupold scopes including four Mark 4 scopes and a Vari-X II. I won't say that Leupold is the best scope for the money since I've only owned Tasco (years ago) and Burris (years ago) which isn't a fair comparison. One of the things about Leupold that bothers me these days is that their glass is now being manufactured in Asia (not Japan!) and many of their products are "assembled" in the US. My Vari-X II is 100% made in the USA which is why I'll never get rid of it. The quality of that scope is amazing. I had to send a Mark 4 3.5 - 10X M3 back to Leupold TWICE due to crap in the field of view (on the reticle). Hopefully it doesn't have to go back again. Leupold does have fast turnaround on warranty work, they cover the cost of shipping BACK, and the warranty is lifetime. That said, I already had to spend $40 to ship a scope back twice. I used to have a Vari-X III that had to go back for the same reason so Leupold scopes aren't perfect. I'm going to be looking at Nightforce scopes in the future (as well as Leupold).