Look for one that is listed with a nationally-recognized testing laboratory. These heaters have been tested to meet specific safety standards, and manufacturers are required to provide important use and care information to the consumer. On heaters that are not listed, consumers have less assurance that the safety features and operating instructions are adequate.
If you’re just starting out, three power tools for general woodworking that are worth spending more money on include a good tablesaw, router and drill press. With these three, plus some hand tools, you will be able to build many of the projects in how-to magazines. Which tool you buy first can depend on the projects you are planning, but a good saw usually gets priority.