There are many ways to approach purchasing your first Z-Wave light switch, but the best piece of advice is probably to do your research. Myriad reviews exist online – try Amazon for customer reviews, or browse Engadget, CNET, and Wired for high-quality, professional hardware reviews.
That being said, here are a few places to start: begin with GE, whose switches are durable, simple, and affordable. The GE In-Wall Z-Wave Toggle Switch is appropriate for any room in the house, and enables homeowners to control lights in different rooms – all from a centralized location, usually a tablet or smart phone, but a controller would also do the trick. As long as you don’t require a dimmer, the GE In-Wall Toggle Switch is probably a safe bet.
For something more sophisticated, consider a wall mounted dimmer by Linear, an affordable option that does everything the GE Toggle Switch can – except it also dims connected lights. Aspire RF dimmers by Eaton are compatible with a range of lighting “loads”, from LED to incandescent, and open up a whole new world of options, from dimming to fan control and more.