If you need a weapon mounted night sight for under $1000, the only options I'd consider are mil-surp cascade systems. They give Gen2+ to early Gen3 performance and are built to take the recoil. They are used, heavy, old, and whine a bit, but they are work horses meant to live unfriendly lives. Anything new production that's digital or gen1, regardless of the marketing telling you how super great their Gen1 is, would be a waste of money in my opinion. I'd love to be satisfied with a $500 new production option, but nothing I've seen so far comes close. The day you look through a good Gen3 setup is the day you quit wanting Gen1 and start finding a way to budget for something better.
Well I'm not sure that buying old, used "mil surp cascade" systems is really a beneficial recommendation. The amount of counterfeit and damaged NV floating around on the used market makes any purchase quite risky, not to mention night vision tubes have a finite life span.
I admit I don't know much about casacade systems so I did some quick research. I am ighly skeptical of your claim of Gen2+ quality since I have yet to see a picture that comes close.
I read a very informative thread on AR15.com by CJ7hawk who builds cascade tube systems for around $250 dollars. Putting aside that I doubt the OP is trying to build his own system, the photos of the tube quality do not match what you are claiming. I would say the image quality is better than average gen 1, but no where close to gen 2. It actually resembles CORE quality. So you can DIY for $250 or buy new production for $550.
I'm not sure what it takes to satisfy you, but if you are expecting gen 2 quality for $500 dollars then you will be waiting a long time. Maybe in 3-5 years digital will be that quality but who knows at what price. If you are looking for useable night vision, new production, in the $500-$800 range then the CORE is the best route.
While CORE does not contain a micro channel plate (and so by definition lands in the Gen 1 category) that is where the parallels end. Instead of glass, CORE tubes use a specially formulated ceramic compound fused with metal alloys similar to those used in production of Gen 2 and Gen 3 image intensiffier tubes. No other gen 1 product, digital product, or "mil surp cascade" can make that claim.
Also, Armasight has great customer service. So since the OP is looking for something reliable, that is a buying factor compared to a DIY/used system where you will get no support.
We agree that night vision marketing does a poor job of presenting realistic performance expectations. That is why our department posts so passionately about night vision products. We also agree that once you start using and testing NV, you realize that nothing compares to gen 3 and if you can find a way to budget it then it is the best route to go.
However, just like not everyone needs or can afford an Aimpoint or ACOG, not everyone needs or can afford gen 3 night vision. I have both a gen 3 monocular and the CORE monocular. they are vastly different in quality. but they are both useable. If I go out at night with a friend, we are both able to navigate/function even though the image quality is miles apart and while most of my friends can't afford gen 3 night vision, they could afford a CORE unit.
Really, anyone looking for night vision under 1k should consider all the options and weigh them against their needs. As much as we don't like digital night vision here, there is a market out there for the product and some of the digital is quite useable (although I'm not sure if the x-sight counts yet...so far the sightmark photon and armasight drone are all I'm willing to advise as useable).
To get back to the OP....if you truly aren't in a rush like you said, then I'd wait at least a bit. See if ATN updates solve their problems. I still think the x-sight has too many features packed into it. It isn't really a night vision scope. Even ATN describes it as a digital day scope with night mode...
So as I said, if you are looking for a KISS useable quality NV scope then Armasight CORE is probably the best bang for your buck. If you were going digital under 1K, the sightmark photon is a better choice than the ATN in my opinion. The Armasight Drone is probably the best digital out there currently but it has the price tag to match. I wouldn't buy used night vision regardless of the generation.
-Matt S.