I love Pico Remotes, but if you only need one and don't consider the price (and reliability) worth it, the Zooz ZEN34 remote looks promising. It looks about like a regular paddle switch, so it would be great for controlling a light, and it supports mulit-taps (Z-Wave Central Scenes), so you can those to perform other actions, too (similar "real" Z-Wave switches that support this: HomeSeer, Inovelli, Zooz, etc.)--if you can remember what they are.
I have a few and haven't had any problems so far, but they're also pretty new so I can't speak to long-term reliability. They are 700-series Z-Wave, which is neat--at least the 700 part. If you are averse to Z-Wave or don't have an existing mesh, you might want to think twice about adding battery devices first.