I'd like to add two points, if I may: (1) After selecting and then buying a digital scope you might also consider finding a used analog scope to have as well. The analog scopes allow you to view signal features not so readily viewable with the lower end digital offerings. (2) I've not used them myself but you might also look into the Digilent; i.e., Analog Discovery 2, modules which can offer a rich feature set including a built in function generator, logic analyzer, metering etc.