Buy the best you can afford. Frequently, when you have an electrical problem, others here can suggest tests to be made to find the problem. You may not know how to do the tests but others can guide you through it. Meter readings are essential for a rapid solution. No meter, no solution.
Also, in the course of doing the above, you will learn tricks to put in your memory bag.
P.S. having an amp meter can be very helpful.