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What do you want in features? Mil/mil, FFP, illumination, ect. There's a lot of info out there on scopes.
Features details being unknown, in that price range I'd suggest a Bushnell Tactical 5-15x40mm.
Depends on your definition of long range and what features you want on the scope. To get a "starting" scope for long range you probably have to be in the $1000 to $1300 range. Top end scopes start at the $3000 range and go up from there.
I had a hawke 6-24 sidewinder for $500 that worked fine pretty good glass and repeatable turrets . It was on a 7mm rem mag for over 2 years and had lots of use with no issues . Only downside was it was big and heavy bu $500