I have a different opinion to most when it comes to scopes. There's no getting away from the fact that more expensive scopes perform better than cheaper ones, although the incremental gain in quality of top-end scopes is quite out of synch with the extra cash you will need to hand over. So whilst top-end scopes are poor value, they are still better than mid-range scopes.
The other side of the coin is that a quality scope will likely stay with you for a lifetime, and being a youngster you will gain much more "life" from investing in quality now, than would some of us older farts who hang around this forum!
In the past, I've gone without alcohol, tobacco, meals out, entertainment, etc., just to invest in a decent scope that will stay with me forever. I class "decent" as Swarovski, Kahles, Zeiss, Nightforce. Leupold make the list, but only with their top-end models that are in the same price range.
In the situations where I couldn't reach out for a top-end lifetime companion, I've chosen a stop-gap model, such as the excellent value Nikon ProStaff that others recommended on this thread. With this option, you get reasonable glass for not too much investment, something to get you through until you can afford the "real thing".
If your budget is 600$, then spend 150$ on a ProStaff today and stuff the other 450$ into your scope fund for the future. Happy Hunting!