1. Under $100
I've never had any luck with scopes this cheap. I've always "inherited" these scopes when buying a used rifle with a cheapy scope and had them fail. A Bushnell on a 10-22 comes to mind.
2. 100 - 300: I have a Leupold VX-1 sitting on a .17HMR that has worked very well for the last 10 years. I expect it will provide another 10 years of service without any problems.
Burris Fullfield 3-9x40 also another very good scope.