If you want to save some money and still have a great oscilloscope, a kit could be a good idea. With the DIY kit, you are going to be able to build your own scope. This could be a fun project, and it can help you to learn more about what it takes to put together a scope.
While it can be fun, you will also find that it is going to take some knowhow and some work. One of the things that you will want to do is to read the instructions carefully. Instead of proceeding without knowledge when you have a question, you should double check the instructions. If they do not provide you with any clear answers, you can contact the manufacturer, or even connect with others online who may have built the kit in the past. They will have the insight that you need.