Don't overthink this OK? It's just a grinder. Sears has some good ones for about 25 to 50 bucks and you'll get your money's worth. If you're a tool junkie like me get 2! One for your wire wheel and one for your grinding disc. Get a cheap one and an expensive one. I suggest the paddle trigger since if you drop it then it will automatically shut off. By-the-way good luck in your class.