I've been looking at scopes online, and it looks like there's a wide range of price and (presumably) quality. I've got an older rifle that cost $300 so I don't want to spend a grand on a high-end rangefinder scope, but I don't want a foggy piece of crap either.

So what's the difference between, say, Bushnell's Banner Dusk & Dawn for $100, and something like a Zeiss Conquest for $1000? And more importantly, as a novice hunter with a WWII era .303, is it a difference I should be concerned with?