How much do you spend on a scope for quality?
Don't you hate it when someone answers a question with a question?
Seriously though, I would ask, "What do you want to do with it?" (That's answering with two questions, which has to be some kind of record....)
I don't claim to be an expert, but my observation is that you can get a pretty decent,
basic scope for about $200-$300. Above that, and $400-$600 will give you a larger objective and tube diameter, increased magnification, and a noticeably brighter image. Beyond that, as someone above said, I think that you start getting into features that most people will never be able or inclined to use.
My Leupold VX-III 4.5-14x50mm is the first brand new scope I've ever purchased, and I think I probably let my enthusiasm at buying new get in the way of buying more wisely. Don't get me wrong. It is a GREAT scope, and I like it very much, but even though I got it for considerably under MSRP, it was still over $500.00. What I've since learned about other scopes, like the Super Snipers, for instance, is that they are probably better suited for what I do with this rifle, and actually cost considerably less than what I paid for the Leupold.
Oh well, I'm not really unhappy about it. But someday, when I buy a lighter rifle more appropriate to hunting than my 700 VSF, I will probably transfer the Leupold to the new rifle, and put one of the other better suited scopes on the Remmy.
You live and you learn, and I wish I had been aware of this website before I started the whole process. I've learned a ton by reading the posts of all the wise heads here.