Best scope I have tried (longer range work) that is Inexpensive but high quality is the Simmons Whitetail Classic Series, mine are 6.5-20x50mm with Mil-Dot reticle .
They are superb scopes for the price ($300 retail) and can be often found for $125 on Midway USA ! They feature one piece tube construction, water and fog proof
w/ a limited lifetime warranty, they use high quality Japanese made camera glass and are manufactured/assembled in the Philippines.
I only buy these scopes for long range work for my AR's because of the excellent build quality and really low price point when found on sale especially....
Another brand/model/series I like is the Bushnell Elite Series, excellent build quality (beats many scopes costing 2-5 times as much, even the German models),
they are all built/manufactured in Japan with the highest quality materials and glass, they come in various sizes and power levels, etc.
For smaller size and power levels you may want to look at the scopes for the pistol/handgun series Simmons makes, they may fit your needs better...
Stay away if possible from the Chinese made scopes.
Good luck.